LIBRARY ANNEX 2 A MEMOIR ON THE INDIAN SITEVEYS, 1875-1890; BY CHAELES E. D. ULAOE. PRINTED AND PUBLISHED BY ORDEE 01" TIER MAJBSTT's SECRETARY OP STATB FOR INDIA IN COIINOII.. LONDON: Ljold by E. A. AENOLD, 37, Bbdfokp Street, Strand, W.C. ARCHIBALD CONSTABLE & Co., 14, P uihament Street, S.W. KEGAN PAUL, TKENCii, TRUBNEE, & Co., LI Mil ED, P/teknostek Houm., Cfaring Cross Road, W.C. HENRV S. KING & Co., 65, Coeniiill, E.G. LUZAC & Co., 46, Great Russktx Street, W.C. B. QU4inrClf, )', PrcCAUILLY, \V. ; AND EDWARD STANFORD, 2G and 27, Cockspuj- Strukt, CnAKixa Ci-c-- S.W. 1891. Price Seven Shillings and Sixpence. PS (&mm\\ ^mtxmii ^\)sxmi THE GIFT OF H.^^'VVl^ ■^M:njiXfuiAi'£^ K\\\%^\ ^|Ml^ Cornell University Library DS 417.I39B62 A memoir on the Indian surveys, 1875-189 3 1924 023 945 102 „„,..,. The original of this book is in the Cornell University Library. There are no known copyright restrictions in the United States on the use of the text. http://www.archive.org/details/cu31924023945102 .Mt '7 ' * -.;dian marine surveys. defined. The party were tlien conveyed to Beyt harbour, in Baroda State, where the fixing of the position of the new lighthouse, in process of building, and a plan of the harbour and entrance channels were desired. This survey was duly completed on the 4-inch scale. Kg. 2 Boat party, under Lieutenant W. H. Coombs, undertook surveys of the entrance to the Chittagong river, and of Akyab, the latter being on the scale of 3 inches to the mile and embracing an area of 60 square miles. Operations were much delayed by the deplorable condition of the steam cutter, which broke down continually, and which Lieutenant Coombs was obliged to work at a dangerous amount of pressure to enable him to get even so moderate a speed of three knots an hour. The total Avork during the season showed an exceedingly good record, the " Investigator" and the two boat parties having been all working at their full strength. Exclusive of the Meghna recon- naissance, 320 square miles of soundings had been taken, and 32 square miles of topography in detail, 250 coast line in linear miles, and 60 deep-sea soundings made. The " Livestigator " was reported by Lieutenant Ohanner to be admirably adapted for the work, being very handy and light in running soundings from 25 to 100 fathoms. At the beginning of the season, 1883-84, Commander Dawson resumed charge, and the first piece of work undertaken was the survey of Cochin on the 8-inch scale, which some four years previously had been postponed owing to the death of Lieutenant Morris Chapman, late I.N. The Cochin river entrance, the bar, and backwater were all sounded, the area amounting to 12^ square miles, and the positions of the bar buoys, as previously laid down, were found to be considerably in error. The vessel then proceeded, via Colombo, to the coast of Burma, and on its way took a line of deep-sea soundings across the Bay of Bengal from Dondra head, the southernmost point of Ceylon, to the vicinity of Cheduba island. At the mouth of the Sandoway river Lieutenant Channer was left for the purpose of surveying the approaches to Tongoup and Sandoway, while Commander Dawson went on to the entrance of the Eangoon river, where numerous complaints had been received as to the extension of the banks, silting of channels, and general alterations in the hydrography of the Rangoon river. This survey proved to be lengthy and difficult, and several new channels and INDIAN MARINE SURVEYS. 21 great clianges in tte main condition of the river were ascertained to have taken place. It was completed in the early part of March; no fewer than«168 square miles being sounded over on the 2-inch scale in the Rangoon river and its approaches, from the China Bakir river and entrance to the Port of Rangoon. The port itself was sounded on the 6-inch scale. It was ascer- tained that the time of high water at full and change of the moon at Rangoon had become about 45 minutes earlier than it was in the year 1829, a change accounted for by the scour of the river having, increased in consequence of artificial embank- ments, &c. Oheduba strait and Ramri roadstead were nest taken in hand, a detached boat party under Lieutenant Helby, R.N., being told off to the former, while the " Investigator's " officers were engaged on the triangulation of the whole, as well as on the detailed survey of Ramri strait. The survey of the approaches to Sando- way and Tongoup, covering 301 square miles, had been made as mentioned above by Lieutenant Channer. Boat party No. 1, under the charge of Lieutenant T. 0. Pascoe, was employed during the latter part of 1883 on the survey of Quilon, where the Travancore Government was anxious to construct a deep-water harbour, there being no other harbour on the Travancore seaboard, and the backwater?.', which extend 100 miles altogether to the north and south, offering great advantages for boat traffic up to the foot of the hills. The party returned to Bombay by Christmas day, and the remainder of the season was taken up with the surveys of Mahuwa or Mowa and Shial Bet. No. 2 Boat party, under Commander Palle, I.M., mapped out Vizagapatam and Calingapatam, and under Lieutenant Morris Smyth, R.N., who took charge on the 1st February, made a survey of Negapatam and Nagore. Thus the full programme drawn up for the Season 1883-84 (with the exception of the search for the Sacramento shoal, which owing to the want of a vessel for the purpose had to be abandoned) was carried out, with the additions of the entrance to the China Bakir river, the approaches to Sandoway and' Tongoup, and the port of Negapatam. The total out-turn for the season amounted to 11 charts and plans, covering 746 square miles of soundings, with 15 deep-sea soundings. 22 INDIAN MARINE SURVEYS. The next year (1884-85) saw Commander Alfred Carpenter, R.N., assume the direction of the operations, in place of Commander Dawson, the Department during the interval between the two commands being placed in charge of Lieutenant Channer, E.N. The " Investigator's " first course was to Sandoway lioads, where work was immediately commenced in continuation of the Cheduba and E,amree harbour surveys of the previous season. The Cheduba straits were completed in December 1884 after a year's work, during which 83 linear miles of coast and 905 square miles of soundings were charted, ■ new shoals were discovered, and the so-called Port Childers, formerly described as an excellent harbour, was proved to be full of dangerous pinnacle rocks. An examination was made of the Orissa coast from Dhumra river to Balasor, but no detailed marine survey of the shore was carried out. Soft mud flats dry at low water extended two or three miles ofi" its entire face, while dense jungle and mangrove swamps formed the actual coast. Many of the stations along the shores made by the great trigonometrical surveyors some years previously had become submerged : the two-fathom line extended from three to four miles off shore, and at six miles no portion of the coast could be seen from a ship's deck. A camping party, landed on Shortt island, proceeded to delineate the Palmyras shoals, 88 square miles of which were charted, while the " Investigator " re-sounded the whole of the bank of soundings (or Pilot's Eidge) between False Point, Palmyras Point, and the Eastern channel light-vessel, carrying the soundings out to 30 fathoms. The positions of the various soundings were found astronomically, and every observation carefully checked by four or five observers, each with his own sextant, as attention had been repeatedly called by captains of vessels bound for the Hugli river to the erroneous nature of the soundings on published charts of this part of the Bay of Bengal. The result of the survey showed an almost identical bottom contour to that on the Admiralty chart (False Point to Mutlah) as delineated by Mr. E. C. Carrington. The amount of square miles sounded over by the Pilot's Eidge survey was 2,400. On its completion the "Investigator's" boats assisted in sounding the extreme seaward face of the Palmyras shoals, which had apparently projected eastward half a mile from their former position. INDIAN MARINE SURVEYS. 23 The bar of the Dhumra river was found also to have altered considerably since 1882. In March 1885 an examiaation was made by the " Investigator " of the curious submarine ravine called the Swatch-of-no-ground, south of the Sundarbans. It was found to have an average breadth of nine miles, with a floor of from 600 to 400 fathoms depth, and inclined sides of soft mud of about 1 in 4. The mouths and sands of the whole delta of the Sundarbans converge to throw their ebbing waters towards the Swatch, and one suggestion has been that the eddy caused by these waters meeting has tended for many ages to prevent the mud held in suspension from settling over the central cleft, and thus the banks on either side have grown seaward while the Swatch has retained its original depth. The result of the 1884-5 season's work of the Marine Survey of India was 11 charts and plans, including one of the entrance to the Rajpuri river by a boat's party, under Lieutenant E. Helby, R-ISF, The " Investigator " ran also over 4,500 linear miles of soundings. In the department of zoological and botanical work the general expe- rience of Commander Carpenter, R.N., and Lieutenant Ohanner, E..N., who had both served on board H.M.S. " Challenger," proved most valuable. Under the supervision of Mr. G. M. Giles, M.B., F.R.C.S., who acted as surgeon-naturalist, some interesting hauls from deep-sea trawling were made, though the appliances had been long disused, and the microscope was one of very old-fashioned construction. On the whole the season of 1884-85 had been one of fair weather, and the outcome of work was larger than during any previous year. In March 1885, the " Investigator " left the Sunderbuns and carried a line of soundings to Kyauk-pyu in Arakan, whei'e a survey of that port was commenced and finished in April. Seven deep-sea Soundings were taken diagonally across the Bay of Bengal, on the same line but between the soundings taken by Commander Dawson in Decerhber 1883, and thus a complete section of the bay was obtained, the average distance between the casts being 70 miles. The surface temperature averaged 86°-5 ; that of the abysmal regions of the open ocean is universally low, the mean temperature of the sea bottom being everywhere about 36° in very deep water, this being the temperature of greatest density. 24 INDUN MARINE SURVEYS. The following- charts and plans were draughted Scale. Charts. Approaches to Sandoway - 1 inch to a mile. North and West coasts of Cheduba - - ^ » ji False Point to Mntlah river i ?> 1) Sketch of Orissa coast - 1 " !> Plans. Kamrce harbour, Cheduba - 3 inches to a mile. Cheduba strait - - - 2 'I )j Kyauk-pyu - - - . - 3 " » Palmyras shoals - 3 " » ]Mergui ])arbour - 6 » i> Tavoy river - 2 5> )> Bhaunagar, Kathiawar - 6 " Jl „ „ (in three sheets) - 20 " )) Eajpuri or Jaiijira harbour - 4 >) !) All the above, with the exception of the large scale of Bhaunagar (which was for local engineering purposes), were completed and sent to the Hydrographer, and four of the plans were photo-zincographed at Poona and sent to the Chief Commissioner of Burma for local distribution. The approaching outbreak of war with King Theebaw necessitated some scheme for piloting a flotilla advancing on Mandalay and Bhamo, for buoying the river and for preserving the buoys, as native pilots beyond the frontier were not to be had. A river survey party under Commander A. Carpenter, R.N., was accordingly formed, with a small reserve party under Commander P. J. Falle, I.M.' wliich was established at Pagan, about half-way between the frontier and Mandalay. The main party, on joining the war flotilla at Minhla, were sent forward to lead the fleet up to Mandalay, throwing INDIAN MARINE SURVEYS. 25 the survey launcli ahead ^o sound whenever there was a doubt as to which channel the m.ain stream had adopted for the dry season. The possession of a gun and a bluejacket's crew were a very service- able help to them when sounding ahead of the other vessels. Com- mander Carpenter and }\is party then piloted the flotilla up to Bhamo, having first taken the pilots over the shallowest portions and examined the latest-formed channels. A complete sketch survey was made of the river from Thayetmyo to Bhamo, and was checked by astronomical observations at 20 positions, forming altogether a valuable addition to geography. The survey party returned to Eangoon and rejoined the " Investigator " towards the end of January, having received the thanks of General Sir H. Prendergast for the skilful assistance which they had rendered to the Irawadi war flotilla. The next survey taken up was that of the Mergui archipelago, the Admiralty chart of which (by Captains Ross and Lloyd of the Indian Navy) was found to be very correct, the only defect being an insufiicient number of soundings. The islets are all steep, and many are mere pinnacles, which makes it probable that similar dangerous pointed rocks exist below water. The Grreat Western Torres islands, immense heaps of boulders overgrown with foliage, were visited, and their position tested by angles to known peaks and found to be 1^ miles out. About this time a fresh datum for the low- water level on Indian charts was resolved upon. Previously, the soundings used to indicate the depth at the average lowest tides of all the lunar fortnights during the year, but as this had been proved by the observations of Major Baird to give in some cases more water than actually existed, owing to the considerable difference on the west coast of India between night and day tides, and on the Bast and Burmese coasts between winter and summer ocean level, it was decided that all soundings and tide tables should be reduced to the lowest low water of the year, provided it was not phenomenal, e.g., brought about by an earthquake or cyclone. The only exceptions to this rule was to be made at Karachi, Marmagao, and in the Eiver Hugli, where the harbour authorities sound their own port* and prefer their own reduction datum. This, however, was a matter which would not confuse the mariner, as at such ports pilots are obligatory. 26 INDIAN MARINE SURVEYS. Lieutenant E. C. H. Helby, R.N., in cliarge of No. 1 Boat survey party, completed the survey of the approaches to Bhaunagar com- menced in the previous season. The soundings extended over 104 square miles, charted on the scale of three inches to a nautical mile. No. 2 Boat party, under Lieutenant M. H. Smyth, R.N., was engaged in buoying the China Bakir entrance to the Irawadi river, and in the survey of Mergui, already mentioned. On the " Investigator's " return from the "Western Torres islands, in March, she completed the southern approach to Mergui, taking in some 20 miles of the beaten track to the southward. Preparis, Narcondam, and Barren islands were next visited. From the last two islands radiating lines of soundings were carried out to ascertain their slope to the floor of the ocean. It was found that they rose from a depth of 1,140 fathoms, but that the north-east slope of Narcondam was being encroached upon by the outlying banks from the great rivers flowing into the Gulf of Martaban. The temperature obs'3rvations taken seemed to favour the inference that no greater depth than 760 fathoms exists in any of the passages between the Andaman islands or between that group and Acheen. In May, Lieutenant A. Channor, R.N., was again appointed as Surveyor in charge (Commander Carpenter being absent on leave in England). The following charts and plans were drawn during the recess : — Irawadi river from Thayetmyo to Bhamo, on f-inch scale in 4 sheets. China Bakir river - Mergui Fells passage - „ Northern approach ,, Kings island to Christmas island Cambay Perim to Bhaunagar ,, Narbada ,, ,, Mandwa Bay, Diu - besides sailing directions, tidal, and other data. These were all completed and forwarded to the Admiralty Hydrographer, copies having been photo -zincographed by the Poona Office. The first place examined by the " Investigator" was Hinze basin on the Burmese coast; the Moscos islands were then re-plotted, and the beaten track in the Mergui archipelago from Christmas on 2-inch hcale „ 2 „ 1 „ 1 » 3 „ 2 „ 6 INDIAN MARINE SURVEYS. 27 island, "where the survey of the previous season had ended, down to Forrest strait near Pakchan. The track is useful to local trade and gives prqiection to vessels trading to Singapore, but until thoroughly surveyed on a large scale, which the trade does not at present seem to require, it is not recommended for large and deep draught vessels. In fact, large ships able to steam against the ordinary monsoon would not use it. On Christmas day a visit was paid to the Elephant islands, close to the south-east side of Domel island. The former are composed of a marble of medium quality, and are very remarkable, both for their abrupt shapes and the beautiful grottoes they contain. The grottoes are mostly accessible at low water through tunnels below high- water mark opening into lofty caves. At the south end of the largest islet, which is 1,000 feet, a low- water tunnel admits a boat into a lagoon, entirely closed by high precipitous cliffs and open only to the sky. Into this lagoon, which seems to be purposely created for smugglers, several cave grottoes open from under the cliffs. An interesting description of these islands will be found in the Hecords of the Geological Survey. "With the object of examining the banks extending off the Sundarbans between Chittagong and the " Swatch," a survey was made of the Meghna flats. No less than 1,750 square miles were sounded, the result being to show more water in nearly every direction than on the published charts, and no extension of the prominent shoals. No. 1 Boat party completed their survey of the channel between the Narbada river and Perim island in the Grulf of Cambay (Narbada river to Perim island), the triangulation being carried across the gulf from the Kathiawar side to Broach point by means of mirrors which were extemporised as heliostats. Mandwa bay, Diu head, was also surveyed, the area sounded being 10 square miles, while in the case of the Grulf of Cambay it was 65 square miles. Between October and February the " Investigator " was at work in surveying the entrance to the Beypur river, and here, and at Calicut, and off Cotta point, an aggregate area of 139 square miles were sounded and plotted on various scales. Boat party No. 2, surveyed the approaches to the Ye river on the Tenasserim coast on the scale of four inches to the mile, but the work was much impeded and interrupted by the ill-health of the party, until on the 18th November no fewer than 23 were on the 28 INDIAN MARINE SURVEYS. sick list, and work was suspended. Places situated on tidal estuaries where fresh, and salt water come into contact are notoriously malarious, and though not of a severe type the disease in this case was extremely persistent. The natural history results were meagre during the year 1886-87, Surgeon G. M. Giles having been deputed to serve with the Chitral and Kafiristan Mission during the greater part of the year. Towards the close of March 1887 the " Investigator " completed the survey of the shallows off the mouths of the Meghna river. The soundings on the " South Patches " proved to be even shallower than hitherto supposed. This shoal has caused a great many wrecks from endeavours to avoid it, for sailing vessels arriving off Chittagong with their chronometers often in error after long ocean passages, give it too wide a berth and get wrecked on the Meghna shoals. With the present corrected chart, vessels making for Chittagong should be able to avoid these Patches, while the rectifi- cation of the peaks and outlying islets of the Andaman and Nicobar groups will tend to decrease the wrecks on the flats of the Sundarbans by enabling vessels standing up the Bay of Bengal to fix their true positions. From the " South Patches " a line of soundings was first run south to the latitude of Akyab, and then a line of deep-sea soundings was carried at intervals of 70 miles to Madras, the depths gradually increasing towards the latter place, 1,820 fathoms being obtained 40 miles off Pulicat, near Madras. This line was the first record of the depth of the northern portion of the Bay of Bengal. Commander Carpenter's paper on the mean temperature of the Bay of Bengal, with its chart, has been published in the Journal of the Asiatic Society of Bengal for 1887, Vol. LVL, Part II. The temperature records afford an extremely useful check on the observations of depth in cases where the sounding wire indicator gets out of order. Off Madras a closely -sounded survey was made, on the scale of two inches to the mile, of the Tripalur reef and Rockingham patch, where three steamers had grounded, one being lost and another very badly damaged. This survey was connected with the land survey stations. A few soundings were also taken north of Pedro Point in Ceylon, where a gap existed in the soundings showing the eastern entrance to Palk straits. INDIAN MARINE SURVEYS, 29 During the recess the following charts and plans were turned oiit by the officers of parties :- the " Investiofator " and her two boat Charts. White Point to Mergui Megna flats Beypur to Sacrifice rock J inch to 1 mile. 1^ inches ^ inch r „ .2 inches 3 8 2 12 3 Plans. Mergui archipelago - Forests strait Tripalur reef,