“LIBRARY

CORNELB
UNIVERSITY, '
ENGINEERING LIBRARY,

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-
DEPARTMENT OF COMMERCE AND LABOR
COAST AND GEODETIC ‘SURVEY

Oo. FZ. or AR
SUPERINTENDENT |

TERRESTRIAL MAGNETISM

DISTRIBUTION OF THE MAGNETIC. DECLINATION IN
ALASKA AND ADJACENT REGIONS FOR 1910

 

‘BY’ 4
R. Le “FARIS

Inspector of ‘Magnetic Work, Assistant, Coast and. Geodetic Survey
: ms,

APPENDIX No. 4—REPORT ‘FOR 1909

 

__ WASHINGTON.
GOVERNMENT PRINTING OFFICE
1910
DEPARTMENT OF COMMERCE AND LABOR

COAST AND GEODETIC SURVEY

QO. HH. TITTMANN
SUPERINTENDENT

TERRESTRIAL MAGNETISM

DISTRIBUTION OF THE MAGNETIC DECLINATION IN
ALASKA AND ADJACENT REGIONS FOR 1910

BY
R. LL. FARIS
Inspector of Magnetic Work, Assistant, Coast and Geodetic Survey

APPENDIX No. 4—REPORT FOR 1909

x

 

WASHINGTON
GOVERNMENT PRINTING OFFICE

1910
CONTENTS.

Page.

MPtTOG HCHO RG esterase ea se oe Sad lea ee Se eee ets pee Nae eee 153
Secular change of declination.____-_.._.___---_--_-------------- Si ipsa I Patio ent A ad REA 154
Table-of magneticdeclinations......---0..----s2--4--4enceccnsnencesscccceshe dee eeeneee 162
Washington, northwesterm part___...-2- .-22---e oe ee cee eee ee eee eee 164
British North America adjacent to Alaska__._-_--.-_._. .----------------------------- 165
Southeastern Alaska sey ass eee acess OSS Ori ncE Rar eeensee Cae Adee SeneG -- 168
Vakiitat Bay toSannak: Tslandsu1. 22:2 oaccertscet sida g toe ta eee i ek et eS 171

PCV Carta TS) aed Sayer pa ery A et peel nat a of oe aie 172
Bering Sea and Arctic Ocean __._-.._-.-.---------- eee 173
Wuk6n Rivers 222 Soe S ooo easet eee Soce ee ate aes hse hice a aeeme esas 174
Results from reconnaissance surveys in the interior________-_-.__-------------------_-- 174
Observations on shipboard__-_______-__----------.---!-12-------------- eee 176

ILLUSTRATIONS.

Page.

Fic. 1, Secular change of declination at Sitka______._-_.__---.--------- 22 ee. 155
2, Secular change of declination at Kodiak____..._.._--__--2-------- 08 156

3. Secular change of declination at Dutch Harbor______.___________-1_____ ee 157

4. Secular change of declination at St. Michael___-__-___.-. 2-2-8 159
Map. Lines of equal magnetic declination and of equal annual change in Alaskafor1910__ In pocket,

152

ol

g
ie
DISTRIBUTION OF THE MAGNETIC DECLINATION IN
ALASKA AND ADJACENT REGIONS FOR 1910.

INTRODUCTION.

The distribution of the magnetic declination over a given area is best represented
by an isogonic chart on which are drawn lines of equal magnetic declination, each line
passing through all the places at which the declination is the same. In practice, since
the observations are necessarily more or less widely distributed, it seldom happens that
the observed values of the magnetic declination are identical at more than a very few
places; but the position of any desired isogonic line may be determined approximately
by interpolation between the observed values. For performing this interpolation either
a graphical or an analytical method may be employed. .

The analytical method consists in deriving by the method of least squares a formula
in which the declination is expressed in terms of the latitude and longitude. This
method is usually employed where the observations are few in number and widely dis-
tributed, or where it is desired to determine for a limited area the uniform distribution
most nearly approximating the observed facts. The resulting isogonic lines are neces-
sarily smooth curves, uniformly distributed.

The graphical method consists in plotting the declination results on a map and draw-
ing the isogonic lines to conform as nearly as possible to the plotted values. In this
way it is possible to give a general idea of the irregularities of distribution and to show
the presence of local disturbances.

The first isogonic chart of Alaska was prepared in 1883 for the epoch 1885. This
was necessarily only a rough approximation, owing to the small number of available
results and the uncertainty of the reduction to epoch. In 1889 a new isogonic chart,
for 1890, was published, but it was based on very nearly the same data as the 1885 chart.
In the succeeding five years many new observations were made and our knowledge of
the secular change of declination was very much increased. Consequently, the chart for
1895, constructed in 1894, represented a decided improvement over those that had pre-
cededit. In 1895 a chart for 1900 was prepared by shifting the isogonic lines of the 1895
chart to correspond with the predicted change in declination for the five-year interval.
In 1902 a comparison of the results of observations made between 1894 ‘and 1902 with
the 1900 chart indicated that little, if any, change was required in the position of the
isogonic lines to adapt them to the year 1902.

All of these isogonic charts were constructed by the analytical method, using a
formula involving the first and second powers of the latitude and longitude, since the
observations were too widely distributed to attempt to show more than the general
distribution of declination. At the present time so much additional data has become

153
154 COAST AND GEODETIC SURVEY REPORT, 1909.

available that it is now possible to make use of the graphical method and show some of
the irrégularities of distribution, at least in southeastern Alaska. The observations
reveal the prevalence of local disturbance all along the coast from Cape Muzon to St.
Michael. It is especially marked at a number of places in southeastern Alaska, sufficient
in amount to affect the compasses of passing steamers. (Coast Pilot of Alaska, Part I,
p- 12.) The most remarkable of these’ areas of local disturbance occurs on Douglas
Island, near Juneau, where special observations made in 1904 revealed the presence of
a local magnetic pole, at which point the needle lost its directive property and toward
which, within a very limited area, the needle pointed from every direction. St. George
Island in Bering Sea was also found to be a highly disturbed region, when observations
were made there in 1897. ‘These areas of extreme local disturbance are in general too
limited in extent to be shown on a map of the scale suitable for an isogonic chart.

The limits adopted for the new isogonic chart of Alaska are somewhat different
from those of the earlier ones. It still extends far enough to the east and south to join
on to the isogonic chart of the United States, but it has been contracted on the west,
because of the lack of reliable data along the coast of Asia. The scale of the present
chart has been changed from that of the former ones, so that it is now about four times
the size of the previous isogonic charts of Alaska.

SECULAR CHANGE OF DECLINATION.

January 1, 1910, has been adopted as the epoch of the isogonic chart and all results
have been reduced to that date. Where the same station has been occupied more than
once, only the most recent value has been used, but where several stations in the same
locality have been occupied at different times, the different results are given. No
attempt has been made to use results of observations made prior to 1870, on account of
the uncertainty of the reduction to 1910.

For determining the secular change of declination since 1870 the results tabulated
below are available. For earlier observations at Sitka, Port Etches, Kodiak, Unalaska,
and Port Clarence, see Appendix 1, Report for 1895. For each station the tabulated
values were plotted on cross-section paper and a smooth curve drawn to correspond
approximately with the plotted values. The correction to reduce an observation to the
year 1910 was then obtained by taking the difference between the ordinate at the date
of observation and the 1910 ordinate. For stations where observations were made
only at two dates, the annual change was assumed to be uniform during the interval.
For convenience a table has been prepared for each ‘‘repeat”’ station giving the reduc-
tion to 1910 at five-year intervals. For observations at other than “repeat” stations,
the reduction to 1910 was obtained by interpolation between the" repeat” station values,
The use of the symbols (a), (b), (c), ete., after the name of the observer in the following
tables indicates the organization to which the observerbelongs. (See explanations, p- 163).

SITKA.

Most of the magnetic observations in the vicinity of Sitka have been made at three
stations: (1) Japonski Island, where the Russians maintained a magnetic observatory
from 1842 to 1867; (2) Parade ground in front of the Presbyterian Church; (3) Absolute
building of the Coast and Geodetic Survey magnetic observatory. A magnetic survey
of Sitka and vicinity in 1901 developed a very uniform distribution of magnetism, the
APPENDIX 4. MAGNETIC DECLINATION IN ALASKA. 155

magnetic declination being 9’.5 greater at the site of the absolute observatory than on
Japonski Island, and 3’.7 greater than at the parade ground. ‘These corrections have
been applied in the following table. Where a number of observations were made in the
same year, only the mean value is given. The values beginning with 1902 are observa-
tory results. In the diagram which follows the table (fig. 1) the tabular values are shown
by dots.

Magnetic declination at Sitka.

[Latitude, 57° 02’.9. Longitude, 135° 20’.1 W.]

 

 

 

Date | Declination Observer Station
East
° /

1867.6 28 58.5 A. T. Mosman (a) Japonski Island

1874. 3 29 03.2 | M. Baker (a) Parade ground

1880. 4 29 14.3 | M. Baker and W. H. Dall (a) Japonski Island

1881.7 29 20.7 | H.E. Nichols (a) Do. ©

1892.6 29 37-6 | F. Morseand J. E. McGrath (a) | JaponskilIsland and parade ground

1894. 4 29 40.6 | F. Morse (a) Parade ground ‘

1896.5 °| 29 43.1 Do. Do.

1900. 8 29 47.4 | L. A. Bauer (a) Parade ground and absolute ob--
servatory site

1901. 5 29 50.5 | J. A. Fleming (a) All three stations

1902. 5 29 «51.1 H. M. W. Edmonds (a) Absolute observatory

1903. 5 29 53-9 Do. Do.

1904. 5 29 «55-8 Do. Do.

1905.5 29 «59.6 Do. Do.

1906. 5 30 03.1 Do. Do.

1907.5 30 06.8 Do. Do.

1908. 5 30 10.4 Do. Do.

 

 

 

 

 

 

Fic. 1,—Secular change of declination at Sitka.

KODIAK.

Nearly all of the recent observations have been made at the same station, on a
bluff on the north side of St. Paul Roadstead, about three-fourths of a mile east of the

town.
156 COAST AND GEODETIC SURVEY REPORT, 1909.

Magnetic declination at Kodiak.

[Latitude, 57° 47’.5. Longitude, 152° 23’.8 W.]

 

Date Declination Observer

 

East
° ,

1867.7 26 o4.
1874.4 25 22:
1880. 5 25. 09.

. T. Mosman (a)
. Baker (a)
Do.

z>

1896. 4 24 33. H. P. Ritter (a)
1906. 8 24 13. W. M. Steirnagle and P. C. Whitney (a)
1907. 6 24 06. A. Crowell (a)

COW ONO

n

1908. 5 24 «#11. . W. Tay (@)

 

 

 

 

 

Fic, 2.—Secular change of declination at Kodiak,

DUTCH HARBOR.

Several stations have been occupied in the vicinity of Dutch Harbor at different
times.

In 1867 Assistant Mosman observed at the end of the spit at the eastern entrance
to Captain’s (now Dutch) Harbor, in $= 53° 54.0 and 4=166° 30’.9.

In 1871, 1873, 1874, and 1880 Messrs. Dall and Baker observed at the astronomic
station on Amaknak Island, just across from Iliuliuk village (now Unalaska) $=53°
52/.9; A=166° 32.3.

In 1883 R. A. Marr observed at a point about 8 feet south of this astronomic station.
APPENDIX 4. MAGNETIC DECLINATION IN ALASKA, 157

In 1889 J. E. McGrath’s station was 267.9 feet northwest of what was supposed to
be the location of the old station of Dall and Baker. At the same time J. H. Turner
made observations at a point 257.1 feet east of the old station. He reoccupied this
station in 1891, as did O. B. French in 1896. In his records of 1891, Mr. Turner says:
“Basaltic rock underlying the surface may possibly affect magnetic measures made in
this region.”’

In 1900 Dutch Harbor had become the more convenient anchorage for vessels, and
in that year a new station was established near the village of Dutch Harbor, at the
“Azimuth Mark” erected in connection with the astronomic observations of 1896 in

 

Fic. 3.—Secular change of declination at Dutch Harbor,

/
$=53° 53’.4 and 4=166° 32’.1. This station has been in use up to 1908. In that
year observations were also made at.a number of places about the bay, one of which,
South Base, is only a short distance from Mr. Mosman’s station of 1867.

The observations of Dall and Baker show an annual decrease in declination of 2’.8
from 1873 to 1880. Observations at Turner’s station give an annual decrease of 4’.5
from 1889 to 1896. Observations at the Dutch Harbor station give an annual decrease
of 4’.7 from 1900 to 1908. ‘Assuming station South Base of 1908 to be comparable with
Mosman’s station of 1867, the average annual decrease for that interval is 3’.9, which is
very nearly the average of the values for the shorter periods.
158 COAST AND GEODETIC SURVEY REPORT, 1909.

Assuming an annual decrease of 4’.5 from 1896 to 1900, observations at Turner’s
station (1889-1896) require a correction of +50’.5 to reduce to the Dutch Harbor
station. Assuming an annual decrease of 3.5 from 1880 to 1889, observations at the
old astronomic station (1871-1880) must be increased by 6’.5 to reduce to Turner’s
station and hence require a correction of +57’.0 to reduce to the Dutch Harbor station.
From observations in 1908, results at South Base must be increased by 31’.0 to reduce to

Dutch Harbor station. This correetion will be used for the 1867 value.

values are given in the following table:

Magnetic declination at Dutch Harbor.

{Latitude, 53° 53’.4. Longitude, 166° 32’.1 W.]

The reduced

 

 

 

 

 

 

 

 

 

 

 

 

 

Date Declination Observer Station
East
° x
1867.7 20 18.4 A. T. Mosman (a) At end of spit
1873.4 20 04.2 W. Hz. Dall (a) Astronomic station
1873.7 19 56.3 | M. Baker (a) _Do.
1874.7 19 39.8 Dall and Baker (a) Do.
1880. 6 19 35.0 Do. Do.
1889. 5 19 02.9 | J. H. Turner (a) Turner’s station
1891.6 18 57.4 Do. Do.
1896, 3 18 34.1 | O. B. French (a) Do.
1900. 8 18 14.0 | J. F. Pratt (a) Dutch Harbor
1904. 5 17 57-3 | H.L. Beck (a) Do.
1908. 3 17 38.4 H. A. Seran (a) Do.
KISKA, KISKA ISLAND.
[Latitude, 51° 59’.1. Longitude, 182° 27’.6 Wi
Date Declination Observer Station
East
° 7
1873.6 11 06.4 | W. Hz. Dall (a)
1904. 6 8 18.2 | H. L. Beck (a) Astro
1904. 6 8 14.3 Do. _Post
1904.7 8 04.5 | H.C. Denson (a) Barrel
Average annual change, —5’.6

 

 

 

ST. PAUL ISLAND,

PRIBILOF ISLANDS

[Latitude, 57° 07’.2. Longitude, 170° 16’.4 W.]

 

 

 

Date | Declination Observer
East
° ,
1874.6 17 24.0 | W.H. Dall (a)
1880. 6 17 39.2 Dall and Baker (a)
1897.5 16 42.0 | G.R. Putnam (a) 2

 

 

Average annual change, —3’.4

 

 
APPENDIX 4. MAGNETIC DECLINATION IN ALASKA. 159

ST. MICHAEL.

Observations have been made at a number of stations at St. Michael, and they
indicate-the presence of much local disturbance. There is not sufficient data, however,
te reduce all the observations to the same station, and only an approximate determina-
tion of the secular change is possible.

 

Fic. 4.—Secular change of declination at St. Michael.
 

 

 

 

 

 

 

 

 

 

160 COAST AND GEODETIC SURVEY REPORT, 1909.
Magnetic declination at St. Michael.
[Latitude, 63° 29’. Longitude, 162° o1’ W.]
Date Declination Observer Station :
East
° ,
1879.6 24 40 Lieut. J. W. Danenhower (d)
1889. 5 2315.0 | J. E. McGrath (a)
1889. 5 23 09.8 | J. H. Turner (a)
1890. 9 23 07.0 Do.
1891.3 23 02.4 Do.
1898. 6 22 17.3 | G.R. Putnam (a)
1900. 5 22 54.0 | E.R. Frisby (a) :
1902.7 21 48.0 | W. Eimbeck (a) Mean of five stations
1905.6 21 53.8 | B.A. Baird (a) Mean of six stations
1908.7 21 41.3 | J. W. Green (a) Mean of three stations
FORT YUKON.
[Latitude, 66° 34’. Longitude, 145° 18’ W.]
Date | Declination Observer
East
° fs
1889. 6 34 46.9 | J. E. McGrath (a)
1890. 6 35 12.0 | J. H. Turner (a)
1908. 5 34 01.6 | J. W. Green (a)

 

 

Average annual change, —3’.1

 

FORT EGBERT.

[Latitude, 64° 47’.

Longitude, 141° 12’ W.]

 

 

Date Declination Observer
East
° Ps
1905.6 35 50.9 | E. Smith (a)
1908. 5 35 55-5 | J. W. Green (a)

 

 

 

Average annual change, +1'.6

 

 

 
APPENDIX 4. MAGNETIC DECLINATION IN ALASKA. 161

NEAR INTERNATIONAL BOUNDARY, YUKON RIVER.
[Latitude, 64° 41’. Longitude, 140° 54’ W.]

 

 

Date Declination Observer

East
° -

1888. 2 35 46.5 | W. Ogilvie (c)

1889. 8 35 47-3. | J. E. McGrath (a)

1890. 5 35 44.1 Do.

1891.4 35 43.0 Do.

"1907.7 35 41.2 | J. C. Pearson (6)
1908. 5 35 36.2 | J. W. Green (a)

 

Average annual change, —o’.4

 

 

 

FORTY-MILE.

[Latitude, 64° 25’. Longitude, 140° 34’ W.]

 

 

Date Declination Observer
East
° - .
1887.7 35 O1.1 W. Ogilvie (c)
1907.7 34 51.8 | J.C. Pearson (b)
1908. 5 34 41.2 | J. W. Green (a)

 

 

Average annual change, —o’.7

 

FORT SELKIRK.

[Latitude, 62° 47’. Longitude, 137° 25’ W.]

 

 

Date Declination Observer
East
° ,
1887.6 3417.0 | W. Ogilvie (c)
1907.7 33 59-7 J. C. Pearson (b)

 

Average annual change, —o’.9

 

 

 

TANTALUS (LEWES RIVER).
[Latitude, 62° 05’. Longitude, 136° 05’ W.J

 

Date Declination Observer

 

East
° /

1887.6 33 54.8 | W. Ogilvie (c)
1907.7 34 15.6 | J. C. Pearson (6)

 

 

Average annual change, +1’.0

 

 

 

 

13436—10 Ul
162 COAST AND GEODETIC SURVEY REPORT, 1909.

From the foregoing tables it will be seen that the secular change of the magnetic
declination is well determined for the past forty years at Sitka, Kodiak, and Dutch
Harbor, and fairly well at St. Michael since 1880. At Kiska the three stations occupied
in 1904 show little local disturbance and the comparison with the 1873 value is there-
fore probably reliable. On St. Paul Island there is no doubt local disturbance. The
results at the stations along the Yukon River near the international boundary indicate
that there has been little change in declination in that region since 1887.

The following table has therefore been used for reducing to the common epoch,
1910, the observations in Alaska and vicinity :

Secular change of the magnetic declination in Alaska.

 

 

| Washing- : f Dutch : St. Fort Fort
ton, west | Sitka Kodiak | yarbor Kiska | yichael | Yukon | Egbert
o + o + oo. o 7 o 7 or o + o

Latitude | 47 30| 57.03 | 57 48| 53 53 | 51 59] 63 29 | 66 34 | 64 47
Longitude} 122 30 | 135 20 | 152 24 | 166 32 | 182 28 | 162 o1 | 145 18 |141 12

 

 

 

° i fe} o ° , ° / ° - ° , ° ‘ co] f
1870 ~—s | +1 29 | +1 16} —1 30 | —2 32 | —3 44
1875 +1 20 | +1 08 | —1 15 | —2 19 | —3 16
1880 +1 13 | +o 59 |] —1 00 | —2 03 | —2 48 | —3 14
1885 +1 05 | +o 50] —o 47 | —1 46] —2 20] —2 24
1890 +o 54 | +o 42 | —o 36 | —1 27 | —1 52 | —1 42 | —1 03] © 00
1895 +o 44; +o 34 | —o 27 | —1 07 | —1I 24 | —I 10 | —o 47 0 00
1900 +o 34 | +o 29 | —o 18 | —o 45 | —o 56 | —o 40} —o 31 0 00
1905 +o 18 | +o 18 | —o og | —o 23 | —o 28 | —o 16 | —o 15 0 00
1910 0 00 0 00 0 00 0 00 0 00 0 00 000 | 0 00

 

 

 

 

 

 

 

 

 

 

 

TABLE OF MAGNETIC DECLINATIONS.

The following table contains the values of magnetic declination used in the con-
struction of the isogonic chart. Principal dependence has been placed on the observa-
tions of the Coast and Geodetic Survey, but all available sources have been drawn
upon for results of observations in the area covered by the chart. For convenience
the results have been divided into several groups, as follows:

 

 

Group cheats, | Meter”

sources

(1) Washington, northwestern part 58 oO
(2) British North America 31 IIL
(3) Southeastern Alaska 171 oO
(4) Yakutat Bay to Sannak Islands 53 7
(5) Aleutian Islands 30 4
(6) Bering Sea and Arctic Ocean | 32 iD
(7) Yukon River 18 é
(8) Interior, results from reconnaissance ° 86

surveys | x

(9) Observations on shipboard 93 77

 

 

 

 

 
APPENDIX 4. MAGNETIC DECLINATION IN ALASKA. 163

In groups 4, 5, and 7 the results are arranged in order of longitude. For the sake
of uniformity all longitudes in the tables are expressed as west of Greenwich. In the
other groups the arrangement is by latitude, beginning with the most southerly
station.

In the column headed ‘‘Source” a very brief reference is made to the publication
or other source from which a result was derived. Fuller references are given below
to supplement those in the table.

The results of magnetic observations by the Coast and Geodetic Survey up to
1881, together with descriptions of stations, were published as Appendix 9 to the
Report of the Superintendent for 1881. These as well as later results are contained
in United States Magnetic Declination Tables for 1902, together with descriptions of
the new stations occupied between 1881 and 1902. This publication also contains
results from other sources, at that time available. Beginning with 1903, the results
of magnetic observations made during each fiscal year and descriptions of the stations
occupied have been published as an appendix to the Annual Report for that year.
(App. 5, 1903; App. 3, 1904; App. 3, 1905; App. 3, 1906; App. 5, 1907; App. 3, 1908;
App. 3, 1909.)

Results obtained by the Department of Terrestrial Magnetism of the Carnegie
Institution of Washington are referred to as Carnegie Institution.

The results of observations made by parties of the United States Geological Survey
engaged in exploring the interior of Alaska have been published in the Annual Report
of the Director for 1899 and in its various other publications.

Results obtained by officers attached to ships of the United States Navy, both
on land and on shipboard, were published in Hydrographic Office Publication No. 109
(H. O. 109). Later results have been furnished in manuscript (U. S. N. MSS.).

° Results obtained by officers attached to ships of the British navy between 1890
and 1900 were published in 1901 by the Hydrographic Department of the British
Admiralty. (B. A., 1901.) Later results were published in 1905, 1907, and 1908
(B. A., 1905; B. A., 1907; B. A., 1908).

Some results obtained by Canadian surveyors, not included in the declination
tables, were published in the Annual Report of the Interior Department of Canada
for 1898. They have been corrected for diurnal variation, so far as possible. ;

A number of results were secured in the summer of 1908 by the party engaged in
running out the one hundred and forty-first meridian boundary between Alaska and
British North America. These have been combined in five groups.

In the secular change tables in the column headed “Observer,” and in the declina-
tion tables in the column headed ‘‘Source,”’ a letter follows the name of the observer
or source to indicate the organization or department under whose direction the observa-
tions were made, viz:

(a) Observations made by observers of the United States Coast and Geodetic
Survey.

(b) Observations made by observers of the Department of Terrestrial Magnetism
of the Carnegie Institution of Washington.

(c) Observations made by observers in the employ of the Canadian government.

(d) Observations made by officers of the United States Navy.

(e) Observations made by officers of the British navy.
164

(f) Observations made under the direction of the British Northwest Boundary

COAST AND GEODETIC SURVEY REPORT, 1909.

Commission of 1858.
(g) Observations made by observers of the United States Geological Survey.
(h) Observations made by officers of the United States Revenue-Cutter Service.

(p) Observations made incidentally by persons not known to be under the direc-

tion of any special organization.

Table of magnetic declinations in Alaska and adjacent regions.

WASHINGTON (NORTHWESTERN PART).

 

 

 

 

 

 

 

 

 

 

Declination
Station Latitude | Longitude yeni a 3 . ~ Source
Observed 1910
East East
° F oO , ° f ° *
Vancouver 45 38 122 40 1895.2 | 21 32.4 | 22 17 D Tables, 1902 (a)
Lower Cascades 45 39 122 00 1881.8 | 19 29.3 | 20 29 Do.
Stevenson 45 41 121 52 1906.5 | 21 25.0 | 21 36 | App. 5, 1907 (a)
Cape Disappointment 46 17 | 12403 | 1895.2 | 21 55.8 | 22 39 | D Tables, 1902 (a)
North Yakima 46 34] 120 32 1906. 2 | 22 35.8 | 22 48 | App. 3, 1906 (a)
Ellensburg 47 00 | 120 32 1906. 2 | 22 52.2 | 23 04 . ‘Do.
Olympia 47 02 122 54 | 1881.8 | 21 34.6 | 22 40 | D Tables, 1902 (a)
Olympia (Howard A) 47 03 | 122 53 | 1906.1 | 23 20.5 | 23 33 | App. 3, 1906 (a)
Nisqually 47 07 122 38 1859.1 | 21 23 23 18 | D Tables, 1902 (p)
Hot Springs 47 12 121 33 | 1906.2 | 22 17.9 | 22 30 | App. 3, 1906 (a)
Tacoma 47 16 122 27 1906.1 | 23 06.6 | 23 19 Do.
Port Orchard 47 32 | 122.38 | 1906.6 | 22 41.6 | 22 52 | App. 5, 1907 (a)
Leavenworth 47 36 120 33 1906.2 | 22 32.0 | 22 44 App. 3, 1906 (a)
Seattle 47 40 | 122 18 | 1908.2 | 23 27.6 | 23 35 | App. 3, 1908 {}
Spokane Falls 47 40 | 117 26 1881.7 | 21 39.4 | 22 29 | D Tables, 1902 (a)
verett 47 58 | 122 13] 1900.9 | 23 15.3 | 23 44 Do.
Kala 48 04 | 122 46 | - 1908.6 | 23 33.7 | 23 38 | App. 3, 1909 (a)
Port Townsend 48 07 122 45 1904.1 | 23 15.7 | 23 35 App. 3, 1904 (a)
Port Angeles 48 08 | 123 26 1908.1 | 23 58.3 | 24 05 | App. 3, 1908 (a)
Striped Peak 48 10] 123 41 1908. 2 | 23 31.6 | 23 58 Do.
Dungeness 48 11 | 123 07 1907.9 | 24 05.0 | 24 13 Do.
Slip 48 16 124 14 1893.6 | 23 30.6 | 24 15 D Tables, 1902 (a)
Cape Flattery 48 22 124 38 1881.8 | 22 44.2 | 23 52 Do.
_Bahada 48 22 124 36 1908.6 | 24 14.1 | 24 18 App. 3, 1909 (a)
Waadah 48 23 124 36 1893.6 | 23 26.3 | 24 11 D Tables, 1902 (a)
Mount Vernon 48 24 722 21 1900.9 | 23 08 23 37 Do.
Classet 48 24 124 40 | 1893.7 | 23 06.4 | 23 50 Do.
Tatoosh 48 24 124 44 1893.7 | 23 45.1 | 24 29 Do.
San Juan Island 48 28 | 122 58 | 1897.6 | 23.31.4 | 24 08 Do.
Bellevue 48 32 123 10 1894.4 | 26 48 27 31 Do.
Mat 48 33 122 57 1894.6 | 23 18 24 O1 Do.
Slope 48 33 123 00 1894.6 | 23 22 24 05 Do.
Bamboo 48 34 | 123 or | 1894.6 | 23 42 24 25 Do.
Windlass 48 35 | 123 10 | 1894.5 | 23 20 24 03 Do
Shaw Island 48 36 122 58 1895.6 | 23 43.6 | 24 24 Do.
Goose 48 36 123 02 1894.5 | 23 33 24 16 Do.
Clover 48 36 123 10 1894.5 | 22 50 23333 Do.
Root | 48 37 | 122 57} 1894.5 | 23 11 23 54 Do.
Fairview 48 38 123 02 1894.5 | 23 55 24 38 Do
Spieden 48 38 | 123 06] 1894.5 | 23 29 «| 24 12 Do.
Morse Island 48 38 | 123 11 | 1894.4 | 23 30 24 13 Do.
Limestone 48 39 123 00 1894.5 | 23 36 24 19 Do.
Middleton 48 42 123 04 | 1894.5 | 22 36 23 19 Do.
Doughty 48 43 | 122 57 | 1894.5 | 23 27 | 24 10 Do.
Dry 48 43 | 123 02} 1894.5 | 25 11 25 54 Do.
APPENDIX 4. MAGNETIC DECLINATION IN ALASKA.

165

Table of magnetic declinations in Alaska and adjacent regions—Continued.

WASHINGTON (NORTHWESTERN PART)—Continued.

 

 

 

 

 

 

 

 

 

 

 

* Local disturbance.

 

 

Declination
Station Latitude | Longitude hee Source
Observed IgIo
° ¢ ° t Pia heel
New Whatcom 48 44 122 29 1900.9 | 23 20.6} 23 50 | D a 1902 (a)
Patos 8 122 58 1894. 23 0 2
ato : 48 47 5 94.5 | 23 04 3 47
Similkameen River 49 00 11g 41 1905.7 | 24 38.3 | 24 52 ie “ "1906 (a)
Similkameen R. 16 m. west | 49 00 120 04 1905.7 | 24 30.2 | 24 44 Do.
Pasayten River 49 00 120 33 1905.7 | 24 49.0 | 25 03 Do.
Skagit River 49 00 121 06 1905.6 | 22 46.7 | 23 o1 Do.
Depot Creek 49 00 121 19 1905.6 | 23 33.1 | 23 47 Do.
Silicia Creek * 49 00} 121 36] 1901.4 | 26 45.8 | 27 14 | D Tables, 1902 (a)
Do. 49 00 121 36 1905.6 | 29 00.0 | 29 14 | App. 3, 1906 (a)
Lemolo 49 00 | 122 07 1905.6 | 23 09.0 |} 23 23 Do.
Sumas 49 00 122 16 1905.6 } 23 46.8 | 24 o1 Do.
_Blaine 49 00 122 44 1905.5 | 24 21.6 | 24 36 Do.
Point Roberts 49 00 123 04 1905.6 | 24 32.9 | 24 47 Do.
BRITISH NORTH AMERICA ADJACENT TO ALASKA
° ‘ °o # ae ge
Beechy Head 48 19 123 39 1908.7 | 26 58.8 | 27 04 | App. 3, 1909 (a)
a Do. ‘ke . 20 123 39 oe 24 37.0 | 25 24 | D ag 1902 (a)
erringham 48 23 123 55 1893.5 | 22 43.0 | 23 29
Victoria 48 25 123 24 1907.7 | 24 15.2 | 24 24 | Carnegie Instit. (b)
Esquimalt 48 25 123 26 1881.8 | 22 55.6 |.24 05 | D Tables, 1902 (a)
ee - . 123 = ae 23 20.0 | 24 06 | B. 1901 (e)
0. 48 2 123 2 1895.9 | 23 35.0 | 24 17 0.
Do. 48 26 123 26 1896.9 | 23 38.0 | 24 18 Do.
Do. 48 26 123 26 1905.8 | 24 19 24 34 | B. A., 1907 (e)
Do. 48 26 123 28 1898.3 | 23 42.9 | 24 20 | D Tables, 1902 {e}
Discovery 48 26 123 14 1892.7 | 23 II1.0 | 23 59 D Tables, 1902 (a
Arch Rock * 48 28 124 12 1893.6 | 25 37.8 | 26 24 é #6. ‘a Mes, (a)
Gordon Head * 48 30; 123 18 | 1894.4 | 23 36 24 20 ss. (a
Darcy Island 48 34 123 16 1894.4 | 22 57 23 41
Vancouver Island 48 34 124 38 1893.6 | 23 51.3 | 24 37. | D mables, 1902 (a)
Halibut 48 37 123 16 | 1894.4 | 22 40 23 24 | C&G. S. Mss. (a)
pe - 40 123 a eee 23 35 24 19 aS
airfax 48 42 123 1 1894.4 | 23 13 23°57 0.
Douglas 48 44 123 II 1894.5 | 23 50 24 34 Do.
South Pender Island 48 44 123 14 1905.6 | 24 12.5 | 24 28 | B.A., 1907 (e)
Saltspring Island - 51 123 30 | 1905.6 | 24 15 24 31 a a at
Active Pass 48 52 123 19 1904.7 | 24 03.5 | 24 22 19 e
Oyster Harbor 49 00 | 123 48 | 1904.9 | 24 34.0] 24 52 | B. A.’ 1905 (e)
Onchucklin Harbor 49 00 125 00 1861.5 | 24 13 26 03 | D Tables, 1902 (p)
Sumas Prairie 49 O1 122 12 1858.5 | 21 30 23, 27 D Tables, 1902 (f)
Rose Island : 49 OL 123 39 boos 7 \ 24 45 25 00 Die (p
Schweltza Lake 49 02 122 00 1859.5 | 21 37 23 31 ables,
Garry Point, Fraser River 49 07 123 11 1864.5 | 22 58 24 38 a a (Pp)
acko Point 49 10 123 54 1904.4 | 24 59.5 | 25 20 . A., 1905 (@
tes 49 10 124 00 1862.5 | 22 57 24 42 D Tables, 1902 (p)
Port Hammond 49 12 122 39 1885.4 | 22 48 23 50 | Canadian Surveyor (c)
Harrison River 49 13 121 56 1885.4 | 22 25 23 27 0.
New Westiminster 49 13 122 53 1862.5 | 22 40 24 25 | D Tables, 1902 (p)
Departure Bay 49 13 123 57 1881.8 | 23 55.6 | 25 04 | D Tables, 1902 (@)
166

COAST AND GEODETIC SURVEY REPORT, 19009.

Table of magnetic declinations in Alaska and adjacent regions—Continued.

BRITISH NORTH AMERICA ADJACENT TO ALASKA—Continued. »

 

Date of ob-

Declination

 

 

 

 

 

 

 

Station Latitude | Longitude | “yo ation Source
: Observed 1910
East East
° / ° / ° / ° /
Barkley Sound 49 14| 124 50| 1861.5 | 24 37 26 24 | D Tables, 1902 (p)
Hecate Bay 49 15 | 125 56| 1861.5 | 22 39 24 25 Do.
Nanoose Harbor 49 15 | 124 08| 1904.5 | 24 48.5 | 25 08 | B.A, 1905 (e)
Jericho 49 16} 123 12 1891.6 | 23 42 24 31 D Tables, 1902 (c)
Port Moody 49 17 | 122 51 | 1891.5 | 23 00 23 49 Do.
Seymour Creek 49 18 | 123 o1 1891.6 | 24 04 24 53 Do.
Burrard Inlet 49 18 123 07 1897.5 | 24 39.0 | 25 16 | B.A., 1901 (e)
Vancouver 49 18 123 07 1898.4 | 24 30.0 | 25 05 Do.
Do. 49 18 123 07 1904.5 | 25 11.5 | 25 32 | B. A,, 1905 (e)
Do. 49 18 | 123 07 | 1906.6] 25 10.0] 25 22 | O. J. Klotz (c)
Baynes Sound, Maple Spit 49 28 124 45 1898.4 | 24 25.7 | 25 OL B. A., 1901 (e)
Yale 49 34 121 25 1871.5 | 24 00 25 24 | D Tables, 1902 (p)
Denman Island 49 36] 124 51] 1895.5 | 23 24.0 | 24 06 | B. A., 1901 (e)
Baynes Sound, Beak Point 49 36 | 124 51 1898.6 | 24 14.1 | 24 49 Do.
Union 49 36.) 124 54] 1908.0] 26 17.5 | 26 25 | App. 3, 1908 (a)
Union 2 49 36 | 124 54] 1908.6 | 26 33.1 | 26 38 | App. 3, 1909 (a)
Friendly Cove 49 36] 126 38] 1881.7 | 23 36.2 | 24 45 | D Tables, 1902 (a)
Port Augusta 49 38 124 55 1905.6 | 26 34 26 50 | B. A., 1907 (e)
0. 49 40 124 55 1905.6 | 26 44 27 00 Do.
Do. 49 40 124 56 1896.8 | 26 04 26 44 | B. A., 1gor (e)
Do. 49 40 | 124 56 | 1897.4 | 26 12 26 50 Do.
Comox 49 40 124 55 1904.5 | 26 40.5 | 27 co | B. A., 1905 (e)
Comox, Goose Spit 49 40 | 124 56] 1898.3 | 26 14.7 | 26 50 | B. A., rgor (e)
Head of Howe Sound 49 42 123 09 1873.5 | 23 54 25 14, | D Tables, 1902 (p)
Salmon River 49 58] 121 31 | 1885.5 | 25 02 26 04 | Canadian surveyor (c)
Duncan Bay 50 04 | 125 19 1896.8 | 24 57.0 | 25 36 | D Tables, 1902 (e)
Squirrel Cove 50 08 | 124 57 1864.5 | 23 56 25 34 | D Tables, 1902 ()
Menzies Bay 50 08 125 24 1895.6 | 24 02.0 | 24 42 B. A., 1901 (e)
Mouth of Thompson River 50 13] 121 36] 1871.5 | 25 00 26 23 | D Tables, 1902 ()
Spences Bridge 50 24 | 121 21 1885.6 | 23 48 24 48 | Canadian surveyor (c)
ee River, mouth of | 50 27 121 22 | 1871.5 | 25 30 26 53 | D Tables, 1902 (p)
icola
North Harbor 50 29 128 04 1881.7 | 24 53.7 | 25 57 D Tables, 1902 (a)
Magnetic station 50 39 120 07 1885.7 | 25 05 26 05 | Canadian surveyor (c)
Kamloops 50 39 120 20 1885.7 | 24 03 25 03 Do.
Near Black Canyon 50 40 I2I 18 1885.6 | 27 28 28 28 Do.
Thompson River 50 41 120 12 1871.5 | 24 00 25 23. | D Tables, 1902 ()
Thompson River, near] 50 42 120 30 | 1877.5 | 24 15 25 27 Do.
Kamloops
Beaver Harbor 50 43 127 25 1866. 5 | 24 30 26 O1 Do.
Ashcroft 50 44 121 17 1907.7 | 27 36.1 | 27 44 | Carnegie Instit. (5)
Thompson River §0 46 | 121 05 | 1871.5 | 23 30 24 53 | D Tables, 1902 (p)
St. Cloud 50 46 121 08 | 1885.6 | 23 56 24 56 | Canadian surveyor (c)
Mouth of Hat Creek 50 47 121 33 1873.5 | 27 00 28 20 D Tables, 1902 (p)
Tracey Harbor 50 51 126 53 1863.5 | 26 40 28 18 Do.
Anchorage Cove 50 53 126 12 1881.6 | 25 42.7 | 26 47 D Tables, 1902 (a)
Waddington Harbor 50 54 124 50 1881.6 | 25 22.0} 26 26 Do.
Blunden Harbor 50 54 127 19 1903.8 | 26 32.8 | 26 55 B. A., 1905 (e)
North Thompson River 50 57 | 120 28 | 1871.5 | 23 52.5 | 25 16 | D Tables, 1902 (p)
et Charlotte Sound 50 59 | 127 31 1903.8 | 26 14.4 | 26 36 | B. A., 1905 (e)
readmill Harbor __ 5106 | 127 34 | 1864.5 | 24 08 25 44 | D Tables, 1902 (p)
North Thompson River 51 12 120 22 1871.5 | 24 07.5 | 25 30 Do.
Do. 51 28 120 25 1873.5 | 25 20 26 40 Do.
Safety Cove 51 32 127 57 1864.5 | 23 38 25 14 Do.
North Thompson River 51 33 120 17 1871.5 | 25 30 26 52 Do.
McLoughlin Bay 52 08 | 128 10! 1881.6 | 26 42.9 | 27 45 | D Tables, 1902 (a)
APPENDIX 4. MAGNETIC DECLINATION IN ALASKA. 167

Table of magnetic declinations in Alaska and adjacent regions—Continued.

BRITISH NORTH AMERICA ADJACENT TO ALASKA—Continued.

 

 

 

Declination
Station Latitude | Longitude Beco Source
Observed I9I0
East East
°o ¥ ° / ° 7 ° /

Rose Harbor 52 09 131 15 1881.7 | 26 00.6 | 27 03 | D Tables, 1902 (a)

Kynumpt Harbor 52 12 128 12 1866.5 | 26 10 27 42 D Tables, 1902 (p)

North Bentinck Arm 52 23 | 126 48 | 1864.5 | 24 46 26 22 Do.

Carter Bay 52 50 128 25 1866.5 | 25 59 27 31 Do.

Head of Dean Inlet 52 52 127 13 1876.5 | 27 00 28 14 Do.

Anchor Cove 53 12 132 14 1866.5 | 24 59 26 29 Do.

Head of Gardner Inlet 53 15 | 127 37 | 1875.5 | 26 30 27 43 Do.

Alpha Bay 53 52 130 18 1866.5 | 26 34 28 04 Do.

Gilcen Charlotte Island 54 00 132 35 1907.5 | 28 23 28 32 B. A., 1908 (e)

Masset, Graham Island 54 05 132 15 1907.7 | 27 58.8 | 28 07 Do.

North Island 54 14 133 00 1908. 5 | 29 03.8| 29 09 | App. 3, 1909 (a)

Port Essington 54 14| 129 47 | 1879.5 | 27 20 28 27 | D Tables, 1902 (p)

Head of Wark Channel 54 18 129 43 1879.5 | 27 30 28 37 Do.

20 miles up Skeena River 54 19 129 19 1879.5 | 27 20 28 27 Do

31 miles up Skeena River 54 22 129 00 1879.5 | 26 45 27 52 Do.

50 miles up Skeena River 54 30 128 35 1879.5 | 26 30 27 37 Do.

Port Simpson 54 34 | 130 26 | 1906.5 | 28 35 28 48 | B. A., 1907 (e)
Do. 54 34 130 24 1907.3 | 28 23 28 33 | B. A., 1908 (e)
Do. 54 34. | 130 26| 1895.4 | 28 37.2] 29 13. | D Tables, 1902 (a)

Lion Point 55 53 130 OI 1895.4 | 30 13-4] 30 48 Do.

Magnetic station 58 28 130 02 1887.5 | 30 26 31 10 | D Tables, 1902 (c)

Lake Lindeman 59 47 135 05 1887.5 | 32 16.8] 32 49

Lake Marsh 60 21 134 17 1887.5 | 32 46.1 | 33 16 De

Miles Canyon 60 42 135 O4 1887.6 | 30 55.2 | 31 20 Do.

White Horse 60 44 135 02 1907.6 | 32 19.4 | 32 24 | Carnegie Instit. (6)
Do. 60 44 135 02 1908. 4 | 32 05.6] 32 09 | App. 3, 1908 (a)

Magnetic station 61 29 | 129 39 | 1887.5 | 33 45 34 15 | D Tables, 1902 (c)
Do. 61 49 131 O1 1887.5 | 34 30 35 00 i

Lewes River 62 04 136 04 1887.6 | 33 54.8 | 34 IT

Tantalus 62 06 136 06 1907.7 | 34 15.6 | 34 20 camegi Instit. (d)

Fort Selkirk 62 47 137 25 1907.7 | 33 59-7 | 34 02
Do. 62 48 137 25 1887.6 | 34 17.0 | 34 27. | D matics, 1902 (c)

White River 63 12 139 38 1887.6 | 34 27.9 | 34 33 Do.

Near Boundary 63 15 140 59 | 1908.5 | 33 06 |-33 06 Boundary survey (a)

Stewart 63 18 139 18 1907.7 | 34 04.4 | 34 04 | Carnegie Instit. (b)

Stewart River 63 22 139 28 1887.6 | 33 52.8 | 33 56 | D Tables, 1902 (c)

Near Boundary 63 34 140 59 1908.5 | 33 34 33 34 | Boundary survey (a)

Dawson 64.04 | 139 26 | 1907.6 | 35 08.6 | 35 09 | Carnegie Instit. (0)
Do. 64 04 139 26 1908.5 | 35 04.0] 35 04 | App. 3, 1908 (a)

Fortymile 64 25 140 34 1908.5 | 34 41.2 | 34 41 Do.

Do. 64 25 140 34 1907.6 | 34 51.8 | 34 52 Carnegie Instit. (6)
Do. 64 26 140 32 1887.7 | 35 O1.1 | 35 02 D Tables, 1902 (c)

Mackenzie River 64 27 125 03 1888.6 | 41 34.6 | -- -- Do.

Camp Davidson 64 41 140 54 1908.5 | 35 36.2 | 35 36 | App. 3, 1908 (a)
Do 64 41 140 54 | 1907.7 | 35 41.2 | 35 41 | Carnegie Instit. (b)

Boundary 64 41 140 54 1888.2 | 35 46.4 | 35 46 | D Tables, 1902 (c)

Boundary A 64 41 141 00 | 1907-7 | 35 31-0 | 35 31 | Carnegie Instit. (2)

Fort Norman 64 54 | 125 43 1888.6 | 33 39.0] -- -- D Tables, 1902 (c)

Porcupine River 65 43 139 40 1888.4 | 37 34.0 | -- -- Do.

Fort Good Hope 66 16 |] 128 31 1888.5 | 41 30.9] -- -- Do.

Camp Colonna 67 25 140 59 1890.5 | 38 06.8 | -- -- D Tables, 1902 (a)

Fort McPherson 67 26 | 134 57 1888.5 | 46 00.8 | -- -- D Tables, 1902 (c)

Herschel I., S. E. side 69 33 | 138 57 | 1889.6 | 43 40 _. -.- | D Tables, 1902 (d)

Mouth of Firth River 69 39 139 51 1890. 3 | 43 22 a Move D Tables, 1902 (p)

 

 

 

 

 

 

 

 
168

COAST AND GEODETIC SURVEY REPORT, 1909.

Table of magnetic declinations in Alaska and adjacent regions—Continued.

SOUTHEASTERN ALASKA.

 

 

Declination

 

 

 

 

 

 

 

 

Station Latitude | Longitude pein Sag : Source
Observed IQIo
East East
° , ° / ° , ° f
Cape Muzon, Cape 54 40 | 132 40 | 1908.6 | 25 18.7 | 25 24 | App. 3, 1909 (a)
Cape Muzon, Y 54 41 132 41 1908.6 | 25 52.1 | 25 57 Do.
Portland Canal, S. B. 54 46] 130 24] 1888.6 | 29 37.3 | 30 24 | D Tables,-1902 (a)
Howkan 54 50 | 132 50] 1881.7 | 27 03.4 | 28 02 App. 9, 1881 (a)
Breeze 54 54| 132 39 | 1907.7 | 28 52 29 00 ©| App. 3, 1908 (a)
Nice 54 58 | 132 47 1907.7 | 29 13 29 21 Do.
Cent 54 59 | 132 54 | 1907.7 | 29 02 | 29 10 Do.
Cordova Bay, Nut 55 02 132 35 1905.5 | 28 58 29 14 | App. 3, 1905 (a)
Tamgas Harbor 55 04 131 28 1883.6 | 28 34.7 | 29 31 D Tables, 1902 (a)
Boreas 55 04 |] 132 58 1907.7 129 17. | 29 25 App. 3, 1908 (a)
Mary Island 55 06} 131 14 1895.5 | 28 21.7 | 28 56 | D Tables, 1902 (a)
Jump 55 07 | 133 OL | 1907.7 | 29 05 | 29 13 | App. 3, 1908 (a)
Side 55 08 132 56 1907.7 | 29 38 29 46 Do.
Moira Sound, Clarno 55 08 132 08 | 1905.4 | 28 35 28 52 | App. 3, 1905 (a)
Time 55 09 132 56 1907.7 | 29 32 29 40 | App. 3, 1908 (a)
Lap 55 10] 132 53 1907.8 | 29 52 30 00 Do. (a) ©
Sukkwan Strait, Salt 55 11 132 48 | 1908.8 | 29 36.4 | 29 40 | App. 3, 1909 (a)
Sukkwan Strait, Fish 55 11 132 49 | 1908.8 | 29 34.2 | 29 38 Do.
Mac 55 11 133 02 1907.7 | 29 00 29 08 | App. 3, 1908 (a)
Flat 55 12 133 05 1907.6 | 29 13 29 22 Do.
Cholmondeley Sd., Mar 55 12 132 07 1908.7 | 27 37 27 42 | App. 3, 1909 (a)
Portland Canal, Ast’l Pt. 55 13 130 04 1888.7 | 27 44.3 | 28 31 D Tables, 1902 (a)
Guide . 55 13 133 04 1907.7 | 29 56 30 04 | App. 3, 1908 (a)
South Base 55 13 133 06 1907.8 | 28 05 28 13 Do.
North Base | 55 13 133 06 1907.8 | 27 33 27 41 Do.
Gone 55 14 133 06 1907.6 | 28 30 28 39 Do.
Cabin 55 16] 133 08 1907.7 | 29 03 29 II Do.
Pin 55 16 133 12 1907.6 | 29 13 29 22 Do.
Stone 55 17 |, 133 12 1907.6 | 28 54 29 03 Do.
Mud | 55 17 133 13 1907.7 | 30 14 30 22 Do.
Antonio 55 17 133 14 | 1907.6 | 30 25 30 34 Do.
Tongass Narrows 55 20] 131 39 | 1906.8 | 28 47 28 59 | App. 5, 1907 (a
Ketchikan, I 55 20} 13% 40 | 1907.6 | 29 08.2 | 29 17 | App. 3, 1908 tas
Ketchikan, II 55 20 I3I 40 1907.7 | 28 59.5 | 29 08 Do.
Flores 55 21 133 18 1907.7 | 29 06 29 14 Do.
McKenzie Inlet 55 21 132 21 1905.6 | 29 56 30 12 App. 3, 1906 (a)
Peninsula Point 55 23 131 44 1885.6 | 28 07.2 | 28 59 | D Tables, 1902 (a)
Ignace 55 23 | 133 25 | 1907.6 | 29 16 29 25 | App. 3, 1908 (a)
Clam 55 28 133 25 1907.7 | 29 45 29 53 Do.
Fish 55 29 | 133 II | 1907.7 | 29 45 29 53 Do.
Kasaan Bay, Long Island 55 30 132 19 1880. 4 | 27 48 28 48 App. 9, 1881 (a)
Southwest Base 55 30 133 12 1907.7 | 29 36 29 44 App. 3, 1908 (a)
Northeast Base 55 30 133 I! 1907.6 | 29 20 29 29 Do.
Port 55 32 133 28 1907.7 | 29 37 29 45 Do.
Kasaan Bay, Crook 55 34 132 29 1908.7 | 29 52.4 | 29 57 App. 3, 1909 (a)
Kasaan Bay, near Crook 55 34 132 29 1908.7 | 30 17.9 | 30 23 Do.
Gibson Anchorage 55 35 132 30 1906.5 | 27 45.0 | 27 58 App. 3, 1906 (a)
Philip Rock 55 38 133 26 1907.7 | 29 42 29 50 App. 3, 1908 (a)
Twin 55 42 133 38 1907.6 | 29 11 29 20 Do.
Union Bay 55 45 132 12 1885.6 | 30 29.8 | 31 21 D Tables, 1902 (a)
Iphigenia Bay:
Gull 55 45 | 133 44 | 1903.7 | 29 03.6 | 29 25 | App. 3, 1904 (a)
Surf 55 50 133 38 1903.7 | 29 O1.0 | 29 22 Do.
Surf A 55 50 | 133 38 | 1903.7 | 29 00.4 | 29 21 Do.
Black 55 52 133 46 1903.7 | 28 25.0 | 28 46 Do.
APPENDIX 4. MAGNETIC DECLINATION IN ALASKA. 169

Table of magnetic declinations in Alaska and adjacent regions—Continued.

SOUTHEASTERN ALASKA—Continued.

 

 

 

 

 

 

 

aoe | Declination
ation . Latitude | Longitude a —  _ Source
Observed I9IO
ee Bay—Continued. ot of oy ae
ack A 5 6

Black B Se el Gee eee |
ce Py 55 54 133 50 1903. 7 | 26 a 7 | 26 . De.
saan 55 54 133 50 1903.7 | 26 37.6 | 26 59 Do.
aoe 2 ot 133 37 | 1903.7 | 29 28.3 | 29 49 Do.
Warren Sees | meg om | aooser | 32.089 | 3247 De.
Warren A 55 56] 133 54 1903.7 | 30 re s 08 Do.
Heather 55 57 | 133 49 | 1903.7 | 28 32.5 28 5 Do.
Heather A 55 57 133 49 | 1903.7 | 28 34. 4 28 a Do.

Head of Portland Canal 55 56| 13000] 1888.5 ‘ 30 08. 6 30 D Table

Dewey Anchorage 55 56 132 22 1886.7 | 28 30 29 . Do ee

ae Bay 56 02 131 06 1893.4 | 30 23.9 | 31 ae Do.

e Bay 56 03 132 52 1905.7 | 29 42 2 App. 3, 1906
roe McArthur 56 04 134 06 1886.6 | 27 50 28 38 D tables, toon ta)
ans 56 05 | 133 58] 1903.7 | 29 08.7 | 29 30 | App. 3, 1904 (a)
Shakan 56 09 133 28 1886.5 | 33 00 33 49 | D ee 1902 (a
Shakan Point 56 09 133 36 1886.6 | 29 25 30 13 ? )
Shakan Entrance : 56 09 133 38 1881.6 | 30 03.2 | 31 00 ae oe "1881 (a)
Red Bay, Sumner Strait 56 20 133 15 1886. 4 | 29 40 30 29 | D Tables, 1902 (a)

wrenget? North Base 56 27 132 23 1886.5 | 29 20 30 09 Do.
rang 56 28 132 2 1893. 8.
Duncan Canal, East Base 56 36 ie of 1885.6 a oa c ey ig
Frederick Sound i 56 55 132 51 1887.4 | 29 38 30 24 Do.
ea Bay, Frederick | 57 00 | 133 20 1887.5 | 30 29.3 | 31 15 Do.
oun
Vicinity of Sitka:
Sitka Magnetic Obsy 57 03 135 20 1909.0 | 30 11.6 | 30 16 | App. 3, 1909 (a)
Jamestown Bay 57 03 135 17 1901.5 | 29 52.6 | 30 19 | C. & G.S. Mss. (a)
Parade Ground 57 03 135 20 1901.5 | 29 46.9 | 30 13 Do.
Public Garden 57 03 135 20 1901.4 | 29 47.2 | 30 13 Do
Block House D. 57 03 135 20 1901.4 | 29 44.4 | 30 10 Do.
Gov’t Reservation 1 57 03 135 20 1901. 4 | 29 40.0 | 30 06 Do.
2 57 03 135 20 1901.4 | 29 43.6 | 30 10 Do.
3 57 03 135 20} 1901.4 | 29 37.8 | 3c 04 Do.
Swanson Property 57 93 135 20 1901.5 | 29 50.4 | 30 16 Do.
Japonski Island 57 03 135 21 1901.5 | 29 41.4 | 30 07 Do.
Indian Park 1 57 03 135 19 1901.4 | 29 43.6 | 30 10 Do.
2 57 03 135 19 | 1901.4 | 29 41.2 | 30 07 Do.
: 3 57 03 135 19 1901.4 | 29 38.0 | 30 04 Do.
Experiment Farm 1 2 03 3 20 | 1901.4 | 29 45.4 | 30 II ee
2 03 | 135 20| 1901.4 | 29 37.7 | 30 04 0.
3 57 03 135 20 1901.4 | 29 48.7 | 30 15 Do.
Cross Mountain 57 03 135 17 1901.5 | 29 54.0] 30 20 Do.
Watson’s Point 57 04 135 22 1901.5 | 29 50.6 | 30 17 Do.
Woewodski Harbor 57 10 134 15 1889.5 | 29 35 30 18 | D Te 1902 (a)
pean, 57 11 | 133 34 | 1887.5 | 30 95.1 | 30 51
0. 57 12 133 30 1889. 3 | 30 13 30 56 Be
Gambier Island, Poke 57 27 133 50 1889.5 | 30 16 30 59 Do.
Killisnoo 57 27 | 134 30] 1895.7 | 29 28.1 | goor | C.& G. S. Mss. (a)
Do. 57 28 134 34 1900. 8 | 28 14.2 | 28 41 D Tables, 1902 (a)
Slocum Arm 57 33. | 136.02 | 1906.7 | 30 12 30 24 | App. 3 1907 (a)
Khaz Bay 57 34 136 05 1906.7 | 30 48 31 00
Sanford Cove, Clot 57 41 133 28 1889.7 | 28 12 28 54 | D tables, 1902 (a)
Icy Strait, First. 58 05 | 135 07! 1901.5 } 30 35 30 57 Do.

 
170

COAST AND GEODETIC SURVEY REPORT, 1909.

Table of magnetic declinations in Alaska and adjacent regions—Continued.

SOUTHEASTERN ALASKA—Continued.

 

Declination

 

 

 

 

 

 

 

 

Station Latitude | Longitude eee - _ Source
Observed 1910
East East
° , ° ¥ ° , ° t
Icy Strait, Peach 58 10 | 135 03] 1901.4 | 30 28 30 50 | D Tables, 1902 (a)
Port Althorp 58 12 136 24 1880.5 | 32 15.5 | 33 06 App. 9, 1881 (a)
Auke Point 58 12 134 33 1890. 5 | 30 44 31 19 D Tables, 1902 (a)
Taku River, Hat 58 12 13409) 1893.5 | 31 02 31 33 Do.
Cross Sound, Spence 58 12 | 136 38] 1901.6 | 30 09 30 31 Do.
Cross Sound, Jog 58 13 136 02 1901.5 | 29 04 29 26 Do.
Cross Sound, Lack 58 13 | 13608] 1901.5 | 31 19 3I 41 Do.
Funter Bay 58 14 134 55 1890.7 | 30 15 30 50 Do.
Vicinity of Juneau:
Station 14 58 12 134 15 1903.6 | 30 54.7 | 31 13 App. 3, 1904 (a)
17 58 12 134 22 1903.6 | 31 09.5 | 31 28 Do.
18 58 13 134 30 1903.6 | 31 07.8 | 31 26 Do.
23 58 13 134 17 1903.6 | 30 12.2 | 30 30 Do.
15 58 14 134 16 1903.6 | 31 39.2 | 31 57 Do.
13 58 14 134 17 1903.6 | 32 32.3 | 32 50 Do.
16 58 15 134 20 1903.6 | 29 31.8 | 29 50 Do.
12 58 15 134 19 | 1903.6 | 29 40.7 | 29 59 Do.
19 58 15 134 38 1903.6 | 31 08.1 | 31 26 Do.
Sheep Creek 58 15 134 19 | 1900.8 | 29 32 30 co | App. 3, 1903 (a)
Station 7 58 16 134 20 1903.6 | 30 12.0 | 30 30 | App. 3, 1904 (a)
24 58 16 134 21 1903.6 | 32 40.6 |°32 59 Do.
Juneau Isle 58 16 134 23 1903.6 | 33 03.2 | 33 21 Do.
Station 1 58 16 134 23 1903.5 | 32 56.0 | 33 14 Do.
9 58 17 134 24 1903.6 | 32 09.0 | 32 27 Do.
25 58 17 134 24 1903.6 | 32 29.1 | 32 47 Do.
28 58 18 134 41 1903.6 | 30 54.4 | 31 12 Do.
26 58 18 134 26 1903.6 | 31 57.8 | 32 16 Do.
Juneau School 58 18 134 25 1903.7 | 31 51.9 | 32 10 Do.
Station 22 58 18 134 25 1903.6 | 31 50.0 | 32 08 Do.
Juneau Hill 58 18 134 24! 1903.6 | 33 33.1 | 33 51 Do.
Station 5 58 18 134 23 1903.6 | 31 39.4 | 31 57 Do.
8 58 18 134 26 1903.6 | 31 43.4 | 32 OI Do.
10 58 18 134 24 1903.6 | 32 16.3 | 32 34 Do.
8 58 20 134 28 1903.6 | 31 41.0 | 31 59 Do.
21 58 21'| 134 30 1903.6 | 31 28.2 | 31 46 Do.
; 27 58 21 134 32 1903.6 | 31 18.2 | 31 36 Do.
Dixon Harbor 58 22 136 53 1905.7 | 30 14.2 | 30 26 App. 3, 1906 (a)
Dundas Bay 58 22 136 22 1900. 8 | 31 14.1 | 31 37 | D Tables, 1902 (a)
a atone re eis 58 23 135 55 | 1901.5 | 30 19 30 41 Do.
ynn Canal, Point Lena 2 1 6 | 1890.
‘ak River 58 24 34 4 90.4 | 30 24 30 58 Do.
stro sta. 58 26 133 59 1893.6 | 30 16.3 | 30 46 Do.
Island 58 30 | 133 54| 1893.4 | 30 49 31 ee Do.
Duck 58 31 133 52 1893.4 | 30 52 31 22 Do.
Terrace 58 31 133 46 1893.4 | 30 57 31 27 Do.
Islet 58 32 133 44 1893.4 | 30 12 30 42 Do.
Fishery 58 32 133 41 1893.5 | 32 06 32 36 Do.
Wood 58 34] 133 40 | -1893.5 | 32 25 32 55 Do.
Lean 58 34 | 133 40 | 1893.5 | 31 28 31 58 Do.
Nob 58 35 | 133 40 | 1893.5 | 31 58 32 28 Do.
Shoal 58 35 | 133 38 | 1893.5 | 32 34 33 04 Do.
_ Fast 58 36 | 133 35 | 1893.5 | 31 38 32 08 Do.
Lituya Bay 58 37 | 137 40| 1874.4 | 30 02.8 | 30 50 | App. 9, 188 (a)
La Perouse, Lituya Bay 58 38 137 41 1894.6 | 30 10.1 | 30 36 D Tables 1902 (
Camp Muir, Glacier Bay 58 50] 136 05 1890.7 | 30 26 30 58 Do.’ 2a)
Anchorage Pt., Chilkat Inlet! 59 10! 135 28! 1894.5 | 30 29.0! 30 54 Do.
APPENDIX 4. MAGNETIC DECLINATION IN ALASKA. I71I

Table of magnetic declinations in Alaska and adjacent regions—Continued.

SOUTHEASTERN ALASKA—Continued.

 

 

 

Declination
Station Latitude | Longitude eee Source
Observed 1910
East East
° v ° y ° / ° ‘
Chilkat * 59 12 | 135 27 | 1890.6 | 30 39 31 09 | D Tables, 1902 (a)
Chilkoot * 59 12 135 21 1890.6 | 19 39 20 09 Do.
Chilkat River:
Dalton 59 20 135 48 1894.5 | 31 56.9 | 32 22 Do.
Open 59 21 | 135 48} 1894.5 | 31 54-5 | 32 19 Do.
Sight 59 23 | 135 53 | 1894.5 | 29 54.9 | 30 20 Do.
Koklux * 59 24] 135 53 | 1894.5 | 24 08.3 | 24 33 Do.
Upper 59 24| 135 54] 1900.5 | 32 23.71 32 44 Do.
Porcupine Creek 59 25 136 16 1900.5 | 31 25.3 | 31 45 Do.
Taiya River, Limber 59 32 135 20 | 1894.6 | 32 09.0} 32 33 Do.

 

 

 

 

 

 

 

YAKUTAT BAY TO SANNAK ISLANDS.

 

ec aa oe East East
° t ° # ° , ° ,
Mt. Hoorts, Yakutat Bay 59 45 139 32 1892.

30 51 31 17. | D Tables, 1902 (a)
Port Mulgrave, Yakutat Bay| 59 34] 139 47 1892. Do.

29 55.8 | 30 22

Ocean Cape, Yakutat Bay 59 33 139 52 1892. 30 24 30 50 Do.
Malaspina, N. E. Base 59 45 140 06 1892. 30 42 31 08 Do.
Malaspina, S. W. Base 59 44 | 140 12 1894. 30 43 31 06 Do.
Yahtse, East Base 59 49 141 08 1894. 30 29.6 | 30 53 Do.
Controller Bay 60 10 144 It 1899. 29 32 29 26 | Alaska Development

Company (f)

 

 

 

 

 

 

6
7
7
6
5
6
5
. Wingham Island 59 59 144 23 1906.5 | 28 52.0 | 28 52 App. 5, 1907 (a)
Kokinhenik Island 60 18 145 03 1898.5 | 29 25.9 | 29 28 | D Tables, 1902 (a)
Orca 60 35 145 41 1898. 4 | 28 46.6 | 28 47 Do.
Do. 60 35 145 41 1900.6 | 29 27.2 | 29 27 Do.
Reef 60 34 | 145 59 1900. 6 | 28 57.7 | 28 58 Do.
Valdez 61 07 146 17 1905.8 | 29 12.2 | 29 13 App. 3, 1906 (a)
Mag 60 28 146 26 1900.6 | 28 40.0 | 29 39 | D Tables, 1902 (a)
Port Etches: First 60 20; 146 31 1902.6 | 28 21 28 20 | App. 5, 1903 (a)
Grass 60 21 146 34 | 1902.7 | 28 17 28 16 Do.
Port Etches 60 21 146 38 1874.4 | 29 09.8 | -- -- App. 9, 1881 (a)
Seward 60 06] 149 26] 1905.6 | 27 00.6 | 26 57 | App. 3, 1906 (a)
Nuka Bay 59 32 150 40; 1906.8 | 26 02.6) 25 57 App. 5, 1907 (a)
Kachemak Bay, Cook Inlet | 59 46 151 09 1895.8 | 24 35 24 10 | F.N. Curtiss (p)
Coal Point, Ugolnoi 59 36 151 24 1880.5 | 25 48.5 | 24 53 App. 9, 1881 (a)
Port Chatham 59 14| 151 45 1906.7 | 24 30.0 | 24 24 | App. 5, 1907 (a)
Kachemak Bay, Cook Inlet | 59 30 151 45 1892.3 | 25 24 30 | Z. L. Tanner (d)
Port Graham, East Base 59 21 151 47 1908.8 | 24 14.4 | 24 12 App. 3, 1909 (a)
Dangerous Cape 59 24 151 53 1880.5 | 24 32.5 | 23 36 | App. 9, 1881 (a)
Port Graham, Danger 59 24 151 55 1908.7 | 23 32.4 | 23 30 | App. 3, 1909 (a)
Point Harriet 60 23 152 17 1908.7 | 25 33-4 | 25 31 Do.
Ushagat, Barren Island 58 56 152 18 1907.7 | 23 30.5 | 23 26 | App. 3, 1908 (a)
Kodiak 57 48 152 24| 1908.8 | 24 12.2 | 24 10 | App. 3, 1909 (a)
Narrow Strait 57 55 152 31 1907.6 | 23 52.4 | 23 48 | App. 3, 1908 (a)
Shuyak Island, Shuyak 58 37 | 152 34| 1908.7 | 24 20.0 | 24 17 | App. 3, 1909 (@)
Afognak Island, Afognak 58 05 152 45 1908.5 | 24 00.6 | 23 58 Ve
Afognak Island, Banner 58 12 152 57 1908.7 | 23 56.5 | 23 54 9.
Bare Island 57 58 153,04 | 1908.5 | 23 53-3 | 23 50 Do.
Onion Bay, Raspberry Island] 58 03 153 13 1908.5 | 23 47-5 | 23 44 a
Cape Douglas 58 51 153 18 1908.7 | 24 29.9 | 24 28 ne
Augustine Island 59 21 153 24! 1908.5 ! 22 19.9 | 22 17 oO.

* Local disturbance.
172 COAST AND GEODETIC SURVEY REPORT, 1909.

Table of magnetic declinations in Alaska and adjacent regions —Continued.

YVAKUTAT BAY TO SANNAK ISLANDS—Continued.

 

 

 

 

Declination
Station Latitude | Longitude Dees oe aes Sa Source
Observed I9IO
East East
° / ° / ° / O° 7
Kiukpalik Island, Shelikof | 58 36 | 153 34 | 1908.6 | 24 43.6 | 24 41 App. 3, 1909 (a)
Strait
Iliamna Bay 59 37 | 153 37 | 1907.5 | 22 58.8 | 22 54 | App. 3, 1908 (a)
Uyak Bay, Harvester Island} 57 38 153 52 1908. 5 | 22 41.2 | 22 38 | App. 3, 1909 (a)
Miller Island 56 58] 154 07 1906. 7 | 23 06.0 | 22 58 | App. 5, 1907 (a)
Snug Harbor 57 00 | 154 09 1906. 5 | 23 O1.4 | 22 53 Do.
Chirikof Island 55 48 155 43 | 1874.4 | 23 00.9 | 21 29 | App. 9, 1881 (a)
Semidi Islands 56 05 156 39 | 1874.4 | 22 56.9 | 21 21 Do.
Chignik Bay 56 19 | 158 24 | 1874.5 | 22 O1.7 | 20 18 Do.
Chiachi Islands 55 52 159 05 1874.5 | 21 55-9 | 20 09 Do.
Little Koniuji Island 55 03 159 22 1893.5 | 20 22 19 26 | H. O. 109 (d)
Little Koniuji Island, N. W. | 55 03 159 23 1880.5 | 21 25.2 | 19 55 App. 9, 1881 (a)
Harbor
Kupreanof Harbor 55 48 159 25 1901.4 | 20 39 20 12 D Tables, 1902 (a)
Little Koniuji Island 55 160 1893.5 | 20 I5 19 19 | H. O. 109 (@)
Shumagin Island, Hum-| 55 19 | 160 31 1880.6 | 20 17.0 | 18 42 | App. 9, 1881 (a)
boldt Harbor
Port Moller 55 55 160 35 1874.6 | 21 22.2 | 19 29 Do.
Portage Bay 55 35 160 38 | 1893.7 | 20 23 19 27 | H. O. 109 (ad)
Dolgoi Island, South end 55 03 | 161 43 1880. 6 | 17 59 16 19 | App. 9, 1881 (a)
Belkofski; Dolgoi Island 55 05 162 00 1880.6 | 21 25.7 | 19 45 Do.
Bailey Harbor, Belkofski 55 09 162 07 1879.5 | 21 08 19 24 | G. W. Bailey (h)
Peterson Bay, Sannak I. 54 24 | 162 38] I901.7 | 18 19 17 47. | D Tables, 1902 (@)
Acherk Harbor, Sannak I. 54 29 162 49 1901.6 | 18 18 17 46 Do.
Amagat Island 54 54] 162 53 1901.5 | 18 25 17 53 Do.
Otter Cove 54 46 163 20 1901.6 | 19 30 18 57 Do.

 

ALEUTIAN ISLANDS.

 

 

 

 

 

 

 

East East
° t ° ¥ ° ta ° f
Ugamak 54 13 164 47 1901.6 | 18 45 18 10 D Tables, 1902 (a)
Tigalda Island, Tigalda Bay | 54 08 | 165 00 | 1901.6 | 17 03 16 28 Do.
Tigalda Island, Tigalda 54 08 165 08 1901.6 | 22 56 22 20 Do
Basalt Rock 54 07 165 23 1901.6 | 17 32 16 56 Do
Rootok Island, Rootok Pass| 54 03 165 31 1901.7 | 16 28 15 53 Do
Egg Island, Egg 53 52 166 03 1901.5 | 18 22 17 44 Do.
Biorka Island, Biorka 53 50] 166 13 1901.5 | 18 48 18 10 Do.
Unalaska Island, Shelf 53 53 166 14 1901.5 [ 17 38 17 00 Do.
Biorka Island, Strait 53 48 166 18 1901.5 | 17 32 16 54 Do.
Unalaska Island, Food 53 52 166 19 1901.5 | 16 09 15 31 Do
Unalaska Island, Round 53 46 166 23 1901.5 | 20 51 20 13 Do.
Unalaska Island, Flat 53 53 166 30 1908. 3 | 17 09.0 | 17 OL App. 3, 1909 (a)
Amaknak I., North Base 53 55 166 30 1908.3 | 17 43.5 | 17 36 Do.
Amaknak I., South Base 53 54 166 31 1908.3 | 17 07.3 | 16 59 Do.
Unalaska Island, Obs’y 53 53 166 32 1908.4 | 16 18.6 | 16 12 Do.
Amaknak I, Astro. sta. 53 53. | 166 32 1880.6 | 18 38.0 | 16 37 | C. & G. S. Mss (a)
Amaknak Island, near As- | 53 53 166 32 1889.5 | 17 46.0 | 16 17 Do.
tro. station
Amaknak Island, near As- | 53 53 | 166 32 1896.3 | 17 43.6 | 16 44 Do.
tro. station é g
Amaknak I., Rocky Point 53 53 166 32 1908.4 | 18 03.2 | x 6 App.
Amaknak I., Dutch Harbor 53 54 166 32 1908.3 | 17 ad a uP t (2)
APPENDIX 4. MAGNETIC DECLINATION IN ALASKA.

tS

Table of magnetic declinations in Alaska and adjacent regions—Continued.

ALEUTIAN ISLANDS—Continued.

 

 

Station.

Date of ob-

 

Declination

 

 

 

 

 

 

 

 

 

Latitude | Longitude servation Source
Observed I9IO0
East East
fe] f ° 7 ° ot ° 7
Amaknak Island, Eliza 53 54] 166 32 | 1908.3 | 16 30.0 | 16 22 | App. 3, 1909 (a)
Unalaska Island, Eider 53 58 | 166 35 | 1901.5 | 16 23 15 45 | D Tables, 1902 (a)
Unalaska Island, Cove,Pt. 53 24) 167 30 | 1880.8 |] 16 15.3 | 14 12 Do.
Atka Island, Nazan Bay 52 11 174 15 1873.6 | 16 57.3 | 14 04 | App. 9, 1881 (a)
Bay of Waterfalls 51 42 | 17649] 1901.7 |] 10 45 10 o2 | H. O. Mss. (d)
Adak I., Bay of Islands 51 49 | 176 52] 1873.6] 13 52.1 | 10 49 | App. 9, 1881 (a)
Amchitka Island 51 24 | r8o0 48 1873.6 | 7 17.1 | 3 59 Do.
Kiska Island, Barrel 52 00 | 182 27 1904.7 | 8 04.5 | 7 34 | App. 3, 1905 (a)
Kiska Island, Post 51 59 182 28 1904.6 | 8 14.3 7 44 Do.
Kiska Island, Astro 51 59 182 28 1904.6 | 8 18.2 7 48 Do.
Kiska 51 58 182 30 1901.6 | 7 06 619 | H. O. Mss. (d)
Attu Island, Gibson Island 52 56 186 46 1893.5 | 4 35 3 03 H. O. 109 (d
Attu Island, Chicagof Hbr. 52 56 186 47 1894.5 | 10 8 33 | A. F. Fechtebeer (d)
Attu Island, Chicagof Hbr. 52 56 | 186 48 1873.5 743.0] 4 18 | App. 9, 1881 (a)
BERING SEA AND ARCTIC OCEAN.
East East
° , ° , ° # ° ,
St. George Island 56 36 | 169 32 1897.7 | 19 02.7 | 18 04 | D Tables, 1902 (a)
St. Paul Island 57 07 170 16 | 1897.5 | 16 42.0 | 15 42 Do.
Hagemeister Island 58 48 160 40 1874.6 | 22 52.8 | 20 59 | App. 9, 1881 (a)
Clark Point 58 49 | 158 32 1890. 6 | 23 40 22 33 | U.S.8. Albatross (d)
Nunivak Island 60 04 167 14 1902.7 | 17 00 16 30 | App. 5, 1903 (a)
Nunivak I., Cape Etolin 60 25 166 08 | 1874.6 | 21 33.8 | 18 16 | App. 9, 1881 (a)
Kan 61 51 165 34 1899.6 | 19 44.8 | 19 03 | D Tables, 1902 (a)
Bright 62 11 163 58 1899.7 | 20 37.9 | 19 56 Do.
Black (Kripniyuk) 62 20 165 19 1898.7 | 19 42.5 | 18 54 Do.
Kwiklokchun 62 34 | 164 51 1898.6 | 19 48.8 | 19 OL Do.
Head of Apoon 62 54 164 O1 1899.6 | 20 35.8 | 19 54 Do.
Okweah 63 02 164 37 1899. 6 | 20 38 19 56 Do.
Quit, near Kotlik 63 02 163 33 1899.7 | 21 15 20 33 Do.
Kotlik 63 02 163 36 1908.6 | 20 31.0 | 20 27 | App. 3, 1909 (a)
Pastoliak 63 03 163 13 1898.6 | 21 OL 20 13. | D Tables, 1902 (a)
St. Lawrence Island 63 16 168 43 1902.7 | 17 26 16 54 | App. 5, 1903 (a)
St Michael, I 63 29 | 162 OL 1905.6 | 22 11.7 | 21 58 | App. 3, 1906 (a)
II 63 29 162 O1 1905.6 | 22 02.2 } 21 48 Do.
IIIA 63 29 162 O1 1905.6 | 21 31.6! 21 18 Do.
III 63 29 162 O1 1902.7 | 21 43 21 16 | App. 5, 1903 (a)
North 63 29 162 O1 1908.7 | 22 16.6 | 22 13 | App. 3, 1909 (a)
Mesa 63 29 162 O1 1908.7 | 21 36.6 | 21 33 Do.
Hilltop 63 29 162 OI 1908.7 | 21 10.6 | 21 07 Do.
St. Lawrence Island 63 43 I7I 23 1879.6 | 19 05 15 45 A. Wykander (/)
Plover Bay 64 22 173 22 1880.7 | 18 26 -. -- | App. 9, 1881 (a)
Konyan Bay 64 50 172 57 1879.6 | 17 52 Se ise A. Wykander (p)
Current 65 07 165 19 1900.7 | 20 53.3 | 20 16 | D Tables, 1902 (a)
Port Clarence 65 16 | 166 51 1880.7 | 22 45 19 38 | App. 9, 1881 (a)
Do. 65 17 166 46 | 1900.7 | 19 55-4] 19 18 | D Tables, 1902 (a)
St. Laurence Bay 65 35 170 44 | 1879.5 | 20 23 date ches A. Wykander (p)
Big Diomede Island 65 45 169 04 1880.7 | 21 49 Scns App. 9, 1881 (a)
Chamisso Hbr., Kotzebue | 66 13 161 49 1880.7 | 26 49 23 42 Do.
Sound
Pitlekai 67 05 173 30 | 1878.7 | 19 43 eee ee A. Wykander (p)
174

COAST AND GEODETIC SURVEY REPORT, 1909.

Table of magnetic declinations in Alaska and adjacent regions—Continued.

BERING SEA AND ARCTIC OCEAN—Continued.

 

 

 

 

 

 

 

 

 

 

 

 

 

Declination
Station Latitude | Longitude veeeey Source
Observed I91o
East East
° / ° i ° Z ° ¥
Point Hope, nr. end of spit | 68 19 166 46 1889.7 | 23 10 20 28 H. O. 109 (d)
Valley of Three Rivers 68 37 | 141 00 | 1890.3 | 40 33 -. -- | D Tables, 1902 (a)
Irkaipi 68 50 180 00 1878.7 | 17 54 -- -. |,A. Wykander (p)
Near Cape Lisburne 68 53 166 06 | 1880.6 | 25 42.8] -- -- App. 9, 1881 (a)
Near Icy Cape 70 13 162 15 1880.6 | 30 05.7 | -- -- Do.
Icy Cape, near Indian vil- | 70 20| 161 52 1889.7 | 28 51 eet H. O. 109 (d)
lage :
Cross Island 70 27 147 52 1889.6 | 38 40 aa me Do.
Wainwright Inlet 70 35 160 36 | 1880.6 | 38 27 -. -. |'C. L. Hooper (A)
Wrangell Island 70 57 178 10 | 1881.6] 19 55 coe Berry & Putnam (p)
Cape Smyth 71 18 156 39 1889.6 | 33 40 om ee H. O. 109 (d)
Utkiavi, near Point Barrow | 71 18 156 40 | 1883.2 | 35 37.2] -- -- D Tables, 1902 (a)
YUKON RIVER.
i East East
° , ° , ° / °
Andreafski 62 03 | 163 13 1908.6 | 20 13.6 | 20 10 | App. 3, 1909 (a)
Russian Mission 61 47 161 21 1908.6 | 21 27.1 | 21 23 Do.
Holy Cross 62 12 159 46 | 1908.6 | 23 08.2 | 23 04 Do.
Anvik 62 40 160 12 1908.6 | 22 42.3 | 22 38 Do.
Kaltag 64 20 158 45 1908.6 | 24 11.0 | 24 07 Do
Nulato 64 43 158 07 1908.6 | 25 25.2 | 25 21 Do.
Louden 64 37 156 42 1908.6 | 25 06.3 | 25 02 Do.
Kokrines 64 56 154 42 1908.6 | 26 15.4 | 26 11 Do.
Tanana 65 10 152 06 1908.5 | 28 43.4 | 28 39 Do.
Rampart 65 31 150 13 1908.5 | 29 57.4 |] 29 53 Do.
Fort Hamlin 65 54 149 14 1908.5 | 31 46.0] 31 44 Do.
Shaman 66 00 149 06 1891.5 | 33 11 32 05 D Tables, 1902 (a)
Hodzana River 66 15 147 45 1908.5 | 32 00.9 | 31 57 App. 3, 1909 (a)
Fort Yukon 66 34} 145 18 | 1891.5 | 35 05.9 | 34 08 | D Tables, 1902 (a)
_ Do. 66 34 145 18 | 1908.5 | 34 01.6 | 33 58 | App. 3, 1908 (a)
Circle 65 50 144 04 1908.5 | 34 10.6 | 34 07 | % Do.
Island, near Kandig River 65 22 | 143 06] 1908.5 | 34 56.4 |.34 54 Do.
Fort Egbert 64 47 I4I 12 1908.5 | 35 55-5 | 35 56 Do.
RESULTS FROM RECONNAISSANCE SURVEYS IN THE INTERIOR.
East East -
°° ° , ° 7 ° /
Katmai 58 04 154 53 1898.8 | 24 33 24 08 | Report 18
Savonoski 58 34] 155 27 1898.8 | 23 56 ee 28 a, ET)
Naknek Lake 58 48 | 156 35 | 1898.8 | 24 53 24 22 Do.
Nushagak 58 56] 158 27 1898.8 | 25 02 24 26 Do.
Ualik Lake 59 O07 159 28 1898.7 | 23 13 22 35 Do. ~
Kwinak 59 46 162 O1 1898.6 | 20 38 19 58 Do.
On Portage 59 48 160 00 | 1898.7 | 22 OL 21 21 Do.
Kagati Lake 59 53 160 15 1898.7 | 21 14 20 34 Do.
Apokak 60 09 | 162 15 1898.6 | 21 25 20 45 Do.
Kuskokwim Bay 60 35 | 162 16 | 1898.6 | 20 44 20 04 Do.

 

 

 
APPENDIX 4. MAGNETIC DECLINATION IN ALASKA.

175

Table of magnetic declinations in Alaska and adjacent regions—Continued.

RESULTS FROM RECONNAISSANCE SURVEYS IN THE INTERIOR—Continued.

 

 

 

 

 

 

 

 

Declination
Station Latitude Longitude Baa Source
Observed IgIo
East East
° , ° ao ° a °

Bethel 60 47 161 52 1898.6 | 21 17 20 37 ma 1899, part 7 (9)
Kuskokwim River 60 54 | 161 18 |] 1898.6 | 20 22 19 42
Tyonok ‘ 61 04 | 151 10] 1902.4 |] 27 00 26 45 oe nape 45 (9)
Tyonok 61 10 I5I 10 1898. 3 | 27 15 26 45 Report 1899, part 7 (g)
Kuskokwim River 61 17 | 160 45 | 1898.6 | 25 37 24 57 Do.
Mouth Susitna River 61 19 | 150 38 | 1898.4 | 27 15 26 50 Do.
Kuskokwim River 61 26| 160 46 | 1898.6 | 23 50 23 10 Do.
Knik 61 27 149 46 1906.5 | 28 38 28 29 | Bulletin 327 (9)
Kuskokwim River 61 32 160 42 1898.6 | 23 51 23 11 | Report 1899, part 7 (9)
Mouth Yentna River 61 35 | 150 27 | 1898.4 | 27 20 26 55 Do.
Susitna River 61 35 150 30 | 1906.5 | 25 54 25 45 | FA. Cook (p)
Chickaloon Creek - 61 45 148 25 1905.6 | 28 19 28 15 | Bulletin 289 (g)
Station 61 45 151 41 1902.5 | 28 00 27 42 | Prof. paper 45 (g)
Susitna River 61 54 150 07 1898.4 | 27 50 27 25 | Report 1899,part 7(g)
Copper Center 61 58 145 20 1902.5 | 30 38 30 32 | Prof. paper 4: (g)
On Skwentna River 61 58 152 40 | 1898.5 | 27 20 26 50 | Report 1899, part 7(g)
On Portage Creek 61 59 | 152 57 | 1898.5 | 26 58 26 28 Do.
Near Pass 61 59 153 OL 1898.5: | 26 29 25 59 Do.

Do. 61 59 153 05 1898.5 | 25 45 25 15 Do.

On Portage Creek 62 00 | 152 46 | 1898.5 | 27 19 26 49 | Report 1899, part 7(g)
Near Pass 62 00} 153 04 | 1898.5 | 25 58 25 28 Do.
Station 62 06 I51 32 1902.5 | 28 30 28 12 | Prof. paper 45 (g)

Do. 62 II 152 54 1902.5 | 27 15 26 57 Do.

Do. 62 15 152 24 1902. 5 2 15 . 57 te.

Do. 62 1 153 15 1902.5 | 26 40 26 22

Do. 62 13 fer 50 | 1906.5 | 26 II 2601 | FLA. Fk (p)
Forks Susitna River 62 20 | 150 10 | 1898.5 | 29 30 29 05 | Report 1899, part 7(9)
Station 62 26 153 27 1902.5 | 26 45 26 27 Prof. paper 45 (9)

Do. 62 40 | 150 40 | 1906.5 | 27 §2 27 42 | F. A. Cook (p)

Do. 62 40} 152 51 1902.6 | 27 20 27 02 | Prof. paper 45 (9)
Mouth Indian Creek 62 49 | 149 39 | 1898.5 | 29 30 29 05 | Report 1899, part 7(9)
Station 62 53 | 152 16] 1902.6 | 27 30 27 12 | Prof. paper 45 (9)

Do. 63 06 I5I 43 1902.6 | 28 10 ‘27 52 Do.

Chisana Mountain 63 14 | 142 38 | 1898.6 | 32 45 32 40 | Report 1899, part 7(9)
Station 63 15 151 12 1902.6 | 28 30 28 11 Prof. paper 45 (g)

Do. - 63 28 150 38 1902.6 | 28 45 28 26 Do.

Boundary 63 40 141 00 | 1908.5 | 33 38 33 38 | Boundary Survey (a)
Station 63 42 149 24 aay 29 35 29 I 5 Prof. apeeee 45 (9)

0. 6 149 04 1902. 29 50 29 3
Seana a a I4I O1 1908.5 | 33 22 33 22 Boundary Survey (a)

Do. 64 00] I41 OL 1908.5 | 34 22 34 22

Station 64 10 149 00 | 1902.7 | 30 10 a 3 Prof. paper 45 (9)
rtella 64 34} 149 05 1902.7 | 30 45 025 |"

ae Mountain a 42 163 25 1900. 5 | 20 00 19 22 | Spec. Pub. b. (g)

Norton Bay 64 44 161 50 1900. 6 | 23 45 23 08 Do.

On Fish River 64 55 163 15 1900.5 | 21 30 20 52 Do.

Do. 65 06 163 02 1900.5 | 21 45 21 07 Do.

Station 65 06 | 148 53 | 1902.7 | 30 50 30 26 | Prof. os 4 (9)
Head Koyuk River 65 23.| 162 35 | 1900.7 | 20 00 19 23 | Spec. Pu (9)
Station 66 02 149 10 1901.5 | 32 15 31 47 Prof. paper 10 (g)
Mouth Swan River 66 03 | 162 40 | 1901.7 | 23 23 22 50 ns

Station 66 14 148 34 1901.5 | 32 30 32 02 Do.

Do. 66 15 148 02 1901.5 | 32 30 32 02 a

Do. 66 16 147 35 1901.4 | 34 00 33 32 ae
Dall City 66 22] 149 56] 1901.5 | 31 00 30 32. Be
Station 66 26 147 18 1901.4 | 33 00 32 33 10.
176

COAST AND GEODETIC SURVEY REPORT, 1909.

Table of magnetic declinations in Alaska and adjacent regions —Continued.

RESULTS FROM RECONNAISSANCE SURVEYS IN THE INFERIOR—Continued.

 

 

 

 

 

 

 

 

 

 

 

 

Declination
Station Latitude | Longitude Dee ee Source
Observed 1910
East East
° , ° / oO. / ° ,
Station 66 31 146 45 1901.4 | 33 45 33 18 | Prof. paper 10 (@)
Do. 66 34 | 146 13 1901.4 | 34 30 34 03 Do.
Fort Yukon 66 34 | 145 19 1901.4 | 36 00 35 33 Do.
Do. 66-35 145 20 | 1903.5 | 34 35 34 15 | Bulletin 251 (9)
Station 66 36 | 145 38 | I1901.4 | 34 30 34 03 | Prof. paper 10 (g)
Do. 66 47 161 25 1901.7 | 25 00 24 28 Do.
Do. 66 51 156 30 | 1901.6 | 28 30 28 O1 Do.
Do. 66 52 154 47 1901.6 | 29 20 28 51 Do.
Kikiktak 66 52 162 36 | 1901.7 | 24 IO 23 38 Do.
Station 66 53 156 57 1901.6 | 28 15 27 46 Do.
Do. 66 56 160 35 1901.7 | 26 oo 25 28 Do.
Do. 66 58 160 14 1901.7 | 25 30 24 58 Do.
Do. 66 59 153 40 1901.6 | 28 30 28 02 Do.
Do. 67 04 153 58 1901.6 | 29 10 28 42 Do.
Do. 67 05 154 16 1901.6 | 29 30 29 02 Do.
Do. 67 08 157 45 1901.6 | 26 30 26 O1 Do.
Do. 67 09 159 38 1901.7 | 25 30 24 58 Do.
On John River 67 20] 152 09] 1901.5 | 29 23 28 53 | Prof. paper 20 (g)
Station 68 10 I5I 52 IQOI.5 | 31 04 30 34 Do.
Do. 68 13 I5I 45 1901.6 | 30 30 30 OL Do.
OBSERVATIONS ON SHIPBOARD.
Longi- Declination
4 tude
Locality sana West of Date ae Source
aa Observed I9Io
East East
° , ° a ° / ° /
At sea 45 49 | 130 55 | 1904.3 | 22 29 | 22 52 16 | App. 3, 1904 + (2)
Do. 46 10 } 130 05 | 1904.3 | 23 33 23 55 16 Do.f
Off Point Adams L,. S. 46 12 | 124 14 | 1908.9 | 22 34 | 22 38 8 | App. 3, 1909 (a)
At sea 46 20 | 124 55 | 1899.6 | 22 17 22 52 a . A., rgor (e)
Do. 46 45 | 124 26 | 1892.4 , 20 27 | 21 16 16 | H. O. 109 (d)
Do. 47 33 | 122 27 | 1905.3 | 23 15 23 32 16 | U.S. N. Mss. (d)
Port Orchard 47 33 | 122 38 | 1906.4 | 23 08 23 21 16 | App. 5, 1907 (a) °
Seattle Harbor 47 36 | 122 22 | 1908.3 | 23 20 | 23 26 16 | App. 3, 1908 (a)
Do. 47 36 | 122 22 | 1907.8 | 23 25 2% 33 4 Do.
Do. 47 36 | 122 22 | 1907.5 | 23 27 23 36 16 Do.
Do. 47 36 | 122 22 | 1908.9 | 23 34 | 23 38 16 | App. 3, 1909 (a)
Do. 47 36 | 122 21 | 1904.8 | 23 26 23 45 16 | App. 3, 1905 (a)
Do. 47 37 | 122 26 | 1908.0 | 23 22 23 29 16 | App. 3, 1908 (a)
Do. 47 37 | 122 23 | 1906.9 | 23 28 23 39 16 | App. 5, 1907 (a)
Do. 47 37 | 122 24 | 1906.0 | 23 00 | 23 14 16 | App. 3, 1906 (a)
Do. 47 37 | 122 24 | 1909.3 | 23 37 | 23 39 16 | App. 3, 1909 (a)
Puget Sound 47 53 | 122 29 | 1905.4 | 24 12 | 24 29 16 | App. 3, 1905 (a)
Port Townsend 48 06 | 122 45 | 1907.4 | 24 17 24 27 16 | App. 3, 1908 (a)
At sea 48 08 | 123 24 | 1902.4 | 23 39 | 24 05 16 | U.S. N. Mss (d)
Port Angeles 48 08 |} 123 25 | 1904.3 | 24 33 24 54 16 | App. 3, 1904 f (a)
Do. 48 08 | 123 26 | 1897.5 | 23 00 23 39 32 | U.S. N. Mss. (d)

*I, Swung only one way.

 

 

 

 

II. Swung both ways.

 

 

 

} Corrected results,
APPENDIX 4. MAGNETIC DECLINATION IN ALASKA.

ay]

Table of magnetic declinations in Alaska and adjacent regions—Continued.

OBSERVATIONS ON SHIPBOARD—Continued.

 

 

 

 

 

 

 

 

 

Longi- Declination
: tude
Locality eat wt ot Date — Source
wich Observed 1910
East East
° , ° f ° , ° ,
Port Townsend 48 10 | 122 45 | 1892.3 | 23 04 23 53 32 | H. O. 109 (d)
Near Port Angeles 48 10 | 123 2 1896.8 | 23 20 | 24 00 16 | U.S. N. Mss. (d)
Dungeness 48 11 | 123 06 | 1907.9 | 23 57 24 05 16 | App. 3, 1908 (a)
Off Port Angeles 48 15 | 123 23 | 1892.4 | 23 07 23 56 -. | B. A., 1904 (e)
Juan de Fuca Strait 48 15 | 122 56 | 1904.8 | 22 14 | 22 33 16 | App. 3, 1905 (a)

Do. 48 16 | 123 39 | 1907.5 | 24 05 24 14 3 | App. 3, 1908 (a

Do. 48 18 | 122 58 | 1905.4 | 23 11 23 28 16 | App. 3, 1906 (a)

Do. 48 20 | 124 15 | 1897.4 | 23 08 23 47 16 | U.S. N. Mss. (d)

Do. 48 22 122 22 | 1902.9 | 23 40 24 O4 I | B. A., 1905 (e)

Do. 48 22 | 125 15 | 1902.6 | 22 50 | 23 16 I Do.
Victoria 48 22) 123 24 | 1905.4 | 23 53 24 10 16 | App. 3, 1906 (a)

Do. 48 23 | 123 20 | 1900.7 | 24 40 25 12 I | B. A., 1905 (e)

Do. 48 23 | 123 25 | 1892.3 | 23 I1 24 O1 16 | H. O. 109 (d)

Do. 48 23 | 123.26 | 1891.6 | 23 46 24 34 8 Do.

Do. 48°24 , 123 25 | 1903.5 , 23 23 23 46 32 | App. 3, 1904 (a)
Juan de Fuca Strait 48 25 | 124 20 | 1892.4 | 23 00 | 23 49 16 | H. O. 109 (d)
Victoria 48 26 | 123 26 | 1902.8 | 23 33 23 58 I | B. A., 1905 (e)

Do. 48 26 | 123 26 | 1904.6 | 23 45 24 04 I Do.

Do. 48 26 | 123 28 | 1905.9 | 23 20 23 35 I} B. A., 1907 (e)
Off San Juan Island 48 32 | 123 00 | 1892.5 | 23 55 24 44 -- | B. A., 1901 (e)
Haro Strait 48 35 | 123 13 | 1907.6 | 23 OF 23 10 3 | App. 3, 1908 (a)

Do. 48 38 } 123 14 | 1909.3 | 24 OL 24 03 16 | App. 3, 1909 (a)
Bellingham Bay 48 44 | 122 32 | 1894.3 | 23 04 | 23 49 8 | U.S. N. Mss. (d)
Georgia Strait 48 52 | 122 58 | 1907.4 | 24 52 25 O1 16 | App. 3, 1908 (a)

Do. 48 52 | 123 19 | 1905.7 | 24 06 | 24 22 II | B. A., 1907 (e)

Do. 48 55 | 123 17 | 1905.7 | 24 06 24 22 Il Do.

Do. 48 55 | 123 20 | 1909.3 | 24 27 24 29 16 | App. 3, 1909 (a)
Barkley Sound 49 00 | 125 25 | 1901.6 | 22 48 | 23 17 I A., 1905 (e)
Georgia Strait 49 10 | 123 37 | 1909.3 |] 25 14 | 25 16 16 | App. 3, 1909 (a)

Do. 49 12 | 123 46 | 1900.6 | 24 12 24 43 I] B. A., 1905 (e)

Do. 49 15 | 123 16 | 1904.6} 25 48 26 07 I Do.

Do. 49 15 | 123 50 | 1904.6 | 24 57 25 16 II Do.

Do. 49 17 | 123 53 | 1898.4 | 25 20 25 55 II | B. A., 1901 (e)

Do. 49 18 | 123 21 | 1898.6 | 25 20 25 55 I Do.

Do. 49 25 | 123 15 | 1904.5 | 25 36 | 25 56 I | B. A., 1905 (e)

Do. 49 26 | 124 28 | 1898.7 | 24 40 | 25 15 I] B. A., rgo1 (e)

Do. 49 28 | 124 28 | 1907.6 | 24 42 24 51 3 | App. 3, 1908 (a)

Do. 49 30 | 124 31 | 1907.4 | 24 45 | 24 54 16 Do.
Baynes Sound 49 35 | 124 51 | 1909.4 | 25 43 | 25 45 16 | App. 3, 1909 (a)

* Do. 49 35 | 124 52 | 1907.8 | 25 40 | 25 48 16 | App. 3, 1908 (a)

Do. 49 35 | 124 52 | 1908.3 | 25 48 | 25 54 16 | App. 3, 1909 (a)

Do. 49 35 | 124 53 | 1906.5 | 25 48 26 O1 16 | App. 5, 1907 (a)

Do. 49 36 | 124 52 | 1908.3 | 25 50 25 56 11 | App. 3, 1908 (a)

Do. AQ 36 | 124 52 | 1908.3 | 25 37 | 25 43 16 | App. 3, 1909 (a)
Union Bay 49 39 | 124 56 | 1896.8 | 26 04 | 26 44 -- | B. A., 1901 (e)

Do. 49 39 | 124 56 | 1897.0 | 26 50 27 29 am Do.
Georgia Strait 49 48 | 124 54 | 1907.8 | 24 54 | 25 02 16 Ape. 3 oS (a)

Do. 49 53 | 125 03 | 1893.8 | 24 45 | 25 25 16 | H. O. 109 (d)

Do. 49 54 | 125 04 | 1898.3 | 25 20 | 25 55 -- | B. A., 1901 (@)

Do. 49 55 | 125 00 | 1898.3 | 25 13 25 48 oe Do.

Do. 49 57 | 125, 10 | 1908.8 | 26 20 | 26 24 3 | App. 3, 1909 (a)
Discovery Passage 50 09 |'125 22! 1907.6 | 25 46 | 25 55 3 | App. 3, 1908 (a)

13436-—10——I12

*JI. Swung only one way. II, Swung both ways.
178

COAST AND GEODETIC SURVEY REPORT, 1909.

Table of magnetic declinations in Alaska and adjacent regions—Continued.

OBSERVATIONS ON SHIPBOARD—Continued.

 

 

Longi- Declination
. tude
Locality nee rase West ‘of Date oe Source
wich: Observed 1910
East East
° , ° , o , °o é
Otter Cove 50 20 | 125 29 | 1900.6 | 24 48 | 25 19 -- | B. A., 1905 (e)
Johnstone Strait 50 28 | 126 03 | 1909.4 | 24 42 | 24 44 16 | App. 3, 1909 (a)
Do. 50 28 | 126 07 | 1908.8 | 24 32 24 36 8 Do.
Do. 50 32 | 126 41 | 1907.8 | 26 05 26 13 3 | App. 3, 1908 (a)
Do. 50 32 | 126 42 | 1909.4 | 26 08 26 10 16 | App. 3, 1909 (a)
Queen Charlotte Sound 50 45 | 127 15 | 1903.8 | 26 06 26 28 I | B. A., 1905 (e)
Do. 50 49 | 127 28 | 1908.8 | 27 24 27 28 3 | App. 3, 1909 (a)
Do. 50 53 | 127 26 | 1903.8 |] 26 42 27 04 I | B. A., 1905 (e)
Hecate Strait 51 03 ! 128 32 | 1907.4 | 25 34 | 25 43 16 | App. 3, 1908 (a)
Fitzhugh Sound 51 26 | 127 52 | 1908.8 | 26 34 | 26 38 8 | App. 3, 1909 (a)
Do. 51 32 | 127 52] 1909.4 | 27 33 27 35 16 Do.
At sea 51 58 | 131 47 | 1907.4 | 27 O1 27 10 8 | App. 3, 1908 (a)
Kiska Harbor 51 59 | 182 28 | 1904.7 9g 26 8 56 16 | App. 3, 1905 (a)
Lama Passage 52 04 | 127 56] 1909.4 | 25 12 |.25 14 11 | App. 3, 1909 (a)
Do. 52 04 | 128 06 | 1907.6 | 27 00 | 27 Og 3 | App. 3, 1908 (a)
At sea 52 04 | 132 15 | 1906.5 | 26 18 26 30 8 | App. 5, 1907 (a)
Milbank Sound 52 22 | 128 32 | 1908.8 | 30 4o =| 30 44 3 | App. 3, 1909 (a)
Do. 52 25 | 128 33 | 1909.4 | 26 22 26 24 8 Do.
At sea 52 40 | 167 GO | 1907.6 | 16 07 15 56 I | B. A., 1908 (e)
Do. 52 48 | 128 25 | 1909.4 | 28 13 28 15 8 | App. 3, 1909 (a)
Graham Reach 53 11 | 128 36 | 1908.8 | 28 14 | 28 18 3 Do.
At sea 53 20 | 129 11 | 1909.4 | 26 36 | 26 38 16 Do.
Wright Sound 53 22 | 129 17 | 1908.8 | 27 34 27 38 8 Do.
At sea 53 48 | 139 47 | 1907.6 | 26 06 26 I1 1 | Carnegie Instit. (b)
Dutch Harbor 53 53 | 166 32 | 1904.5 | 16 26 16 O1 16 | App. 3, 1905 (a)
Do. 53 54 | 166 31 | 1904.7 | 10 46 16 22 16 Do.
Arthur Pass 53 59 | 130 12 | 1909.4 | 28 18 28 20 16 | App. 3, 1909 (a)
Off Dutch Harbor 54 O1 | 166 32 | 1892.6 | 16 49 15 32 32 | H. O. 109 (d)
Arthur Pass °54 03 | 130 13 | 1908.8 | 27 22 27 26 3 | App. 3, 1909 (a)
At sea 54 05 | 142 13 | 1907.5 | 24 05 24 12 1 | Carnegie Instit. (b)-
Hecate Strait 54 10 | 131 51 | 1906.9 | 28 4o | 28 52 I} B. A., 1907 (e)
Off North Island 54 12 | 132 55 | 1907.8 | 27 55 | 28 03 Il | B. A., 1908 (e)
Chatham Sound 54 15 | 130 30 | 1907.8 | 28 22 28 30 8 a 3, 1908 (a)
Do. 54 16 | 130 37 | 1907.3 | 28 45 | 28 55 -- | H. M.S. Egeria (e)
Do. 54 25 | 130 36 | 1908.3 | 29 07 29 13 8 | App. 3, 1908 (a)
Do. 54 30 | 130 29 | 1906.5 | 29 05 29 18 II | B. A., 1907 (e)
At sea 54 30 | 166 20 | 1907.7 | 16 47 16 37 I! B. A., 1908 (e)
Off Dundas Island 54 41 | 130 43 | 1909.4 | 27 03 27 05 16 | App. 3, 1909 (a)
Off northern end Dun- | 54 41 | 130 54 | 1907.8 | 28 23 | 28 31 8 | App. 3, 1908 (a)
das Island
Dixon Entrance 54 43 | 133 26 | 1906.7 | 28 14 28 26 I | B. A., 1907 (e)
At sea 54 54 | 166 24 | 1893.6 | 17 43 16 30 32 | H. O. 109 (d)
Revillagigedo Channel 55 00 | 131 08 | 1908.8 | 29 08 | 29 12 8 | App. 3, 1909 (a)
Do. 55 00 | 131 05 | 1890.4 | 29 19 30 02 16 | H. O. 109 (d)
At sea 55 05 | 166 30 | 1894.7 | 18 00 16 51 4 | U.S. N. Mss. (d)
Revillagigedo Channel 55 06 | 131 10} 1909.4 | 28 21 28 23 8 | App. 3, 1909 (a)
Clarence Strait 55 06 | 131 50 | 1905.4 | 28 31 | 28 48 16 | App. 3, 1905 (a)
At sea 55 15 | 146 50 | 1906.5 | 24 10 | 24 10 16 | App. 5, 1907 (a)
Near Ketchikan 55 17 | 131 36 | 1907.6 | 28 55 29 04 16 | App. 3, 1908 (a)
Do. 55 17 | 131 36 | 1907.8 | 29 11 29 20 16 Do.
Do. 55 18 | 131 36} 1908.3 | 29 00 29 06 8 Do.
Unga Strait 55 20 | 160 52 | 1894.5 | 20 28 | i9 40 8 | U.S. N. Mss. (d)
Do. 55 24 | 160 31 | 1883.5 | 19 45 18 24 32 | H. O. 109 (d)
Clarence Strait 55 31 | 132 06 | 1896.6 | 28 34 | 29 08 30 | U.S. N. Mss. (d)

 

 

 

*T. Swung only one way.

 

 

II, Swung both ways

 

 
APPENDIX 4. MAGNETIC DECLINATION IN ALASKA,

179

Table of magnetic declinations in Alaska and adjacent regions—Continued.

 

 

OBSERVATIONS ON SHIPBOARD—Continued.

 

 

 

 

Longi- , , Declination
: tude =
oe en | Be PG ine ox
wich | LDH
East East
o , ° , ° t ° ,
At sea 55 42 | 138 53 | 1897.6 | 27 55 28 00 1 | Carnegie Instit. (0)

Do. 55 43 | 151 31 | 1906.5 | 22 38 22 36 16 | App. 5, 1907 (a)
Clarence Strait 55 44 | 132 22 | 1908.8 | 29 32 29 36 8 | App. 3, 1909 (a)
At sea 55 51 | 169 54 | 1891.7 | 16 32 15 08 16 O. 109 (d)

- Davidson Inlet 55 52 | 133 38 | 1904.6 | 29 19 29 38 16 |; App. 3, 1905 (a)
At sea 55 59 | 155 41 | 1906.5 | 21 53 21 44 16 | App. 5, 1907 (a)
Seward Passage 56 00 | 132 02 | 1904.6 | 29 18 | 29 37 Il A., 1905 (e)
At sea 56 03 | 170 16 | 1904.6 | 15 09 14 44 Il Do.

Do. 56 05 | 136 40 | 1894.4 | 27 57 28 32 16 | H. O. 109 (d)
Snow Passage 56 15 | 132-55 | 1904.6 | 29 19 29 38 II | B. A., 1905 (e)
Sumner Strait 56 24 | 133 35 | 1908.3 | 29 59 | 30 05 3 | App. 3, 1908 (a)
Chatham Strait 56 30 | 134 35 | 1894.5 | 30 07 30 42 | 16] U.S. N. Mss. (d)
Off St. George Island 56 39 | 169 23 | 1892.5 | 17 03 15 43 8 | H. O. 109 (d)

, sitka Harbor 57 02 | 135 19 | 1903.6 | 30 02 | 30 23 32 | App. 3, 1904. (a)
0. 57 03 | 135 20 | 1888.4 | 28 50 | 29 34 8 | H. O. 109 (d)
At sea 57 14] 144 18 | 1908.3 | 28 59 29 O1 1 | App. 3, 1908 (a)

Deo. 57 15 | 144 31 ) 1908.3 | 2852 28 54 I Do.

Do. 57 16] 169 30 | 1894.5 | 15 50 14 39 3 | U.S.N. Mss. (d)
Neva Strait 57 20 | 135 40 | 1892.3 | 29 42 30 20 16 | H. O. 109 (d)

At sea 57 23 | 149 35 | 1908.3 | 26 co 26 00 8 | App. 3, 1908 (a)
Chatham Strait 57 25 | 134 51 | 1893.6 | 29 39 30 15 16 | H. O. 109 (d)
Peril Strait 57 29 | 135 07 | 1895.6 | 30 43 31 16 16 | U.S. N. Mss. (d)
At sea 57 36 | 151 36 | 1908.3 | 23 51 23 48 3 | App. 3, 1908 (a)
Shelikof Strait . 57 38 | 154 31 | 1907.6 | 23 47 23 43 16 Do.
Chiniak Bay 57 46 | 152 26 | 1907.4 | 24 12 24 07 16 Do.

St. Paul Roadstead 57 48 | 152 20 | 1908.3 | 24 24 24 21 16 Do.

Do. 57 48 | 152 20'| 1908.8 | 24 14 | 24 12 16 | App. 3, 1909 (a)

Do. 57 48 | 152 21 | 1907.8 | 24 15 24 11 16 | App. 3, 1908 (a)

Do. 57 48 | 152 21 | 1908.2 | 24 08 24 05 16 | App. 3, 1909 (a)
Marmot Bay 57 57 | 152 33 | 1907.6 | 24 14 | 24 10 16 | App. 3, 1908 (a)
Junction Shelikof and | 58 02 | 153 13 | 1908.5 | 22 32 | 22 29 16 | App. 3, 1909 (a)

Kupreanof straits
Stephens Passage 58 04 | 134 04 | 1895.5 | 31 24 | 31 56 32 | U.S. N. Mss. (d)
Young Bay 58 10 | 134 33 | 1889.8 | 31 45 32 22 8 | H. O. 109 (d)
Icy Strait 58 11 | 135 30 | 1896.4 | 30 52 | 31 22 30 | U.S. N. Mss. (d)
Off Couverden Point 58 12 | 135 02 | 1887.4 | 30 53 | 31 33 16 | H. O. 109 (d)
Icy Strait 58 12 | 135 26 | 1892.7 | 30 12 30 45 16 Do.

Lynn Canal 58 20 | 134 55 | 1888.4 | 31 00 | 31 39 16 Do.

Do. 58 20 | 135 06 | 1886.5 | 30 47 31 29 16 Do.

Do. 58 30 | 140 59 | 1893.5 | 29 04 29 19 -- | B. A., rgo01 (e)

Do. 58 34 | 135 10 | 1884.4 | 30 31 31 15 32 | H. O. 109 (d)
Chilkoot Inlet 59 13 | 135 23 | 1886.4 ; 30 00 | 30 36 32 Do.

Seward 60 05 | 149 15 | 1905.8 | 27 02 26 57 16 | App. 3, 1906 (a)

Do. 60 05 | 149 15 | 1905.8 | 27 34 27 29 16 Do.
Resurrection Bay 60 08 | 149 13 | 1905.4 | 26 45 26 40 16 Do.

 

 

 

 

 

 

 

 

*I. Swung only one way.

II. Swung both ways.
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