ES we on a | se . ; : ay a == aS ee aeny THE LIGHT TO LIVE WITH S ia in i {lr mn : -12 Publication No. DP Copyright 1920 by Duplex Lighting Works TING WORKS | //, BLECTRIC CO. \\\\ DUPLEA LIGH Refinement T do J us Necessary GENERA > Of ™m n\n 6 WEST 48th. STREET NEW YORK CITY The Duplexalites described in this publication are manufactured and sold under Duplexalite Corporation patents WITHOUT uJ cs DUPLEXALI Examples of Good and Bad Lighting Using the Same Lamp and Shade Wiki wiels <4 Om LiGH TING? Good Lighting is Found on the Shady Side of a Tree on a Sunny Afternoon ET US substitute for the sun a MaAzpa C lamp, for the sky the ceiling of your room, and for the tree the Duplexalite. From the ceiling you now get a soft radiance which floods the entire room as completely as though it were open to the sky. From the diffusing disc of the Duplexalite, you get a generous addition of light directly beneath, which has all the directional quality of sunlight filtered through foliage. At the same time, the Duplexalite is protecting your eyes from the brilliancy of the MAzDA C lamp as comfortably as the tree offers protection from the glare of the sun. You can no more dispense with the ceiling reflection than you can the sky. Nor would the unshaded brightness of the MAzpa C lamp offer any more advantage to see by than the desert sun at noon. By means of Duplexalite, the MAzpA C lamp has been equipped in a way to produce the most charming lighting effect that occurs in nature. Good lighting is the proper distribution of light Three EE Wiel Aas Ge eae lel The MaAzpA C Lamp is the Sun of Artificial Lighting E all know what happened to the man who took a long look into the face of the noon-day sun before smoked glasses were invented. Of course it was unneces- sary. It is equally unnecessary to gaze directly at the filament of the Mazpa C lamp. The immense amount of research and development work which finally made possible the commercial manu- facture of the Mazpa C lamp, had two important results: First, the Mazpa C lamp surpasses all others in efficiency, both when new and throughout the useful life of each lamp. Second, the discoveries made in the process of perfecting the Mazpa C lamp indicate that any lamps of higher efficiency which may be developed in the future, will have the same typical feature, namely, a very compact filament of high brilliancy. After much study and experiment, devices have been designed to control this wonderful brightness and distrib- ute it wisely for the benefit of eyes and nerves, to our great comfort and efficiency. To use such devices 1s not only desirable, but necessary. When this is done the Mazpa C lamp provides the best lighting obtainable and at the least expense. The highest efficiency lamps that are made in small sizes are the Mazpa B lamps. The following diagram illus- trates the economy of using a Mazpa C lamp instead of several smaller lamps pothy Bopeeaes { 150: WATT MAZDA C LAMP USES 150 WATTS AND GIVES 2049 LUMENS (UNITS OF LIGHT) Four Waele Ch DIE’ ole El TIN.G ‘The Duplexalite Shades the MAzpa C Lamp and Diffuses its Brightness UPLEX Lighting is the natural method of controlling the light from a Mazpa C lamp. The lighting unit designed for obtaining the advantages of Duplex Lighting from the Mazpa C lamp is called the Duplexalite. Duplex Lighting is the natural method of light distribution because it combines a day-like diffusion with direct lighting where most needed. c In every other method of illumination, the element of direct lighting is either lacking or is radiated at unnatural angles at which the eye has no protection. ‘The result is an irritation of the retina, combined with an involuntary contraction of the iris, producing the sensation commonly complained of as “glare.” In a Duplexalite, more than 96% of the light given off is deflected in useful directions; that is, wpward for ceiling reflection and downward for additional intensities — Duplex Lighting. Less than 4% of the light is given off at angles which produce glare, as compared with the usual 30% to 45% with other systems in which any appreciable amount of direct lighting is provided. The illustration on page 9 shows how the exterior of the metal deflector of the Duplexalite is self-illuminated. The diagram below indicates the principles of Duplex Lighting and the typical design of the Duplexalite DiupilLEx Don LIGHTING Five seas The Standard Duplexalite SIAN BYARD. IBAGR ELIE. C0 Ba ba Ba sins HE Standard Duplexalite is the basis of all forms of Duplexalites, and is essential for Duplex Lighting. It consists of the necessary ceiling plate or canopy adapted to all standard ceiling outlets, a suspension made‘of specially constructed silk-covered electric cable with “Acorn” strain-relief grip at top and bottom, an electric lamp socket enclosed in a substantial cover of simple design, a characteristic metal deflector and moulded glass disc supported by flat metal hooks which lock these parts in the correctly focused position for the rated size of Mazpa C lamp. ‘The deflector, socket-cover and canopy are finished in the most durable matt-surfaced porcelain enamel of a deep ivory color, the interior reflecting surface being of white enamel. é Diameter of Number Wattage of Lamp Socket Length Over All Pencece D-131 100-150 Medium 36” ipa D-231 200 Medium 48” 14” D-531 300-500 | Mogul 60” | 16” The Duplexalite is adapted to any requirement where good lighting is sought. In the home it can be used in every room — kitchen, dining room, living room, library, nursery, bedrooms, bathrooms, etc, Below is a picture of the kitchen of the Good Housekeeping Institute. The Du- plexalite was tested by their department of Household Engineering and was award- ed the official approval of the Institute, Serial Number 2009. Good Housekeeping Institute Kitchen Seven DEGORATIVE POSS 1B ESTs Geisseig CER TREX 1 Cee ENE The Unseen Duplexalite Enhances a Beautiful Shade and Produces a Beautiful Lighting Effect HE characteristic distribution of light from the Duplexalite opens up an entirely new field of decorative possibilities. Heretofore the use of decorative shades has been limited by the necessity for producing an acceptable lighting result by means of the fabrics employed. For this reason, it has always been necessary to provide such shades with a white lining and to avoid the use of many colors otherwise desirable, because of their effect upon the light transmitted. The self-illumination of the Duplexalite is sufficient to attractively illuminate any form of decorative shade without interfering in any way with the upward and downward lighting. ‘The significance of this lies in the fact that Duplexalite shades are illuminated for the purpose of beautifying them, instead of being over-lighted for the purpose of general illumination. ‘This permits of the use of almost any translucent fabric which may happen to meet a decorative requirement or suit an individual taste. The photographs reproduced below illustrate the notable fact that the illumination produced with a Duplexalite is unchanged by the addition of the shade. re * Examples of Duplex Lighting with and without a shade RelAIN GE @ Vike VLE MWe @ Eas PaVi eT ROE IBAUN ie sae IIe, N this illustration a Duplexalite shade (of silk) and the Duplexalite deflector (of metal) are shown as transparent in order to illustrate clearly the mechanical con- struction of this effective lighting device. From this illustration it will be undertsood that all light from the brilliant filament of the Mazpa C lamp is utilized in the following way: 1 — From the top of the wide-mouthed deflector a large portion of the rays go directly from the lamp to the ceiling. 2 — All rays intercepted by the metal deflector, which is white enameled inside, are deflected either upward to the ceiling or downward through the diffusing disc. 3 — The rest of the light rays go directly from the lamp to the translucent glass diffusing disc, through which the direct light is filtered to an agreeable softness. 4— A small amount of the light is reflected upward from the outer edge of the diffusing disc so that it illuminates the outside of the metal deflector. It is this self-illuminating feature which makes the Duplexalite so perfect a “servant of light’”— useful but not conspicuous — and which pro- vides the soft beautifying illumination of the Duplexalite shade. In addition to the lighting advantages, please note also the following practical conveniences: 1— The Duplexalite shades may be removed by tilting and taking off sideways. They may be put away for the summer with the curtains, changed from warm colored silks in winter to bright figured cretonnes in summer, or changed from room to room in a few moments for special occasions. 2— Raising the metal deflector straight up a few inches unlocks the diffusing disc which may be washed as easily as a lunch plate, and may be locked into place again by merely raising and lowering the deflector. 3 — The deflector is finished in porcelain enamel and is easily kept clean by occasional dusting. 4 — Duplexalite construction affords the most perfect venti- lation, thus insuring the longest life and efficiency of the Mazpa C lamp. Nine Ll a Oo nm Z LY) me) is a op) ON STANDARD DUPLEXALITE EMEP IERIE 1 BAB DRAB IS eu Ea ia la eis HE Empire Shade is historic. In its dignified simplicity, it embodies the typical construction of all Duplexalite shades, consisting of an upper ring with projecting supports which rest on the deflector, and a substantial frame over which the shade is formed. Its conventional lines conform to the best standards of taste for a wide variety of uses. Empire Shades are made of silk gathered on the frame with silk lining and gimp trimmings. The Empire shade may be ornamented without changing the appearance of P ie dignity and simplicity. j Are Empire shades are made i in old rose, old gold, ecru or blue. pele Se bw Reception Hall of a New York Residence which is lighted throughout with Duplexalite Eleven a See f £9) 7) ny co be 38) = 5°) Oo a Oo in Z (3) 43) 3 Gq op) JPLEX: PANDARD DU ON S’ IMG URE IO! INGE IE Teele IDMONEIGI sp. Gad Gy ba lake: HESE decorative Empire shades are made of colored silks covered with figured net and trimmed with gold or colored braids to harmonize with the colored pattern. The delicate traceries are thrown into just the right relief on a Duplexalite. The patterns are consequently very effective, whether seen lighted or by daylight. Figured Net Shades are made in the following colors: Coror “A” — Blue and gold figured net over gold silk lining, trimmed with gold braid. Cotor “B” — Net with ecru woven ground. Flowers in blue and mulberry. Gray silk lining. Trimmed with blue braid. Cortor “C” — Net with ecru woven ground. Flowers in old rose and blue. Old rose silk lining. Trimmed with old rose braid. TasseEt “‘D’’—which is shown, covers the ivory socket cover and matches the old gold silk of the pendant. It is made of heavy silk fringe and can be put on afanyetimesditer the | uplexaliteiis installed® [tis *put.on and taken off as easily and quickly as the Duplexalite shades.. Note how the Figured Net Shade Harmonizes with the Hangings in this Living Room Thirteen ge i Ao Bee ~eage aS Shas at hae ShadesNo. sores LasselDeand Disc-ocreen eas ON STANDARD DUPLEXALITE Fourteen DINING ROOM DUPLEXALITES INING Room Duplexalites are fitted with shades having the silk closely pleated and finished in ruching form at top and bottom. ‘The silk lining is in every case of a warm colored tint. The Disc Screen is made of light silk trimmed with old gold braid, and covers the glass diffusing disc. Shade No. 5025 has double box pleated tuching at top and bottom and a heavy silk fringe. Dining Room Shades are made in ecru, old gold, old rose, delft blue, French gray or deep red. © Disc. Screens are made sin old gold, old rose or ecru. The table lighting filters through a gold colored silken disc cover while the furniture in the background is enriched by the general illumination. Fifteen Painted Parchment Shade No. 5012 and Tassel ‘‘D” ON STANDARD DUPLEXALITE Sixteen ANON EIO! Ive CimiWWeiNe IBIGI CI G.u baa ahs MONG tthe most useful and durable materials for making Duplexalite shades is Japanese Parchment. Parchment Shades are made in the Empire form and bound with antique gold galloon. Painted Parchment Duplexalites are among the most finished productions obtainable in decorative shades. L Shade 5059 Natural parchment, stripe top and bot- tom. (Blue unless otherwise specified.) Plain Parchment Shades have an antique finish and are bound with antique gold galloon. Shade No. 5051 Hand painted. Birds of Paradise and fol- iage on an antique background. DU PEEXAELLES Silk tassel for socket cover is not included, andthe effect obtained is one of extreme simplicity and high quality. Shade No. sor1 Plain parchment, antique finish . Painted Parchment Duplexalites in a Bachelor's Drawing Room Seventeen ShadésNomsors and lasse: DD ON STANDARD DUPLEXALITE Eighteen IRGUNKE: JONGGE Ede Dp. Gaulig id Bens HE most natural form of Duplexalite Shade is that made of suitable materials suspended from a supporting ring. Somewhat less formal than Empire Duplexa- lites, the Ring Duplexalites offer an opportunity for a more intimate style of decoration. Figured Silk Ring Shades, as illustrated on the opposite page, are finished with antique gold braid and ornamental antique gold fringe. Mulberry, blue or gold ground. Shade No. 5019, below, is of draped China silk in solid colors; old rose, old gold, ecru or blue. Silk braid edging at top and uncut silk fringe at bottom, weighted. Shade 5019 Shade 5018 | be oe SSA gi. Oe Shade 5022 Cretonne Shades are favored for Bedrooms; also for general summer use. No. 5018 is an attractive nursery pattern. No. 5022 is furnished with either reds or yel- low predominating, as ordered. AtlypicalsiotelyGuesty Room Nineteen Twenty SHADE. NO. 5005 | WALDORF-ASTORIA DUPLEXALITES WITH SPECIAL SHADES Shade No. 5005 The Duplexalite Hanger is of draped silk, lined. Trimmed shown has a rigid stem wound with rich silk cord. It is fur- with antique gold lace and bullion nished with a special tassel of silk and bullion fringe, and a fringe. Made in colors as ordered. special ceiling canopy Hnished in gold or silver, as ordered. PPE eo aie Sea Wels eee ite LA Paes TLE AT ES Shade No. 5o004-A Shade No. 5024 Shade No. 5004-B Black Japanese figures on ecru Octagonal shade, shirred silk with Oriental pattern, on a dark back- ground. fringe and antique gold braid. ground. Made in colors as ordered. Twenty-on? iW i | Ty = : SHADE NO. 5026 SHADE NO.S-5002 DUPGRX ADULT ES . Wal rl Bs iC eAo wes Lice lubes Shade No. 5052 Shade No. 5040 Shade No. 5035 Antique gold lace over silk. Bullion and Gold metal lace over shirred silk. Draped chiffon over Galloon braid and silk fringe.* Gold braid and flowers.* flowers.* Shade No. 5026 Shade No. 5002 Heavy, old gold silk fringe. Gold *Made in colors as ordered. Stretched silk, gold and silk braid. braid.* Twenty-two pl eee ele a Ce Nee DP OE XAT eer Dull glazed porcelain enamel in shaded golden brown with decoration fused into the surface in darker tone. The Etruscan Duplexalite is designed to meet those requirements where a neat, though rich, ornamental fixture is appropriate and where no shade is desired. Twenty-Three Duplexalite Diffusing Disc. Disc Screen “B” Disc Screen “A” Tassel “D” HE DIAGRAM below shows the proper hanging length to obtain most uniform light distribu- tion. The shadow line (A) should meet the junction of ceiling and walls. For home lighting, evenness of illumination is not always necessary and the length may be increased, if desirable; although in most cases the hanging length, as sketched, will provide the most satisfactory appearance as well as the best lighting. The length is easily adjusted to suit the requirements when the Duplexalite is being installed. Hanging Length No. D-29 ‘‘Pullite’? Canopy Switch should be specified where there is no wall switch. Standard and Etruscan Duplexalites are shipped complete in substantial cartons, as follows: Number Size of Carton Weight D-131 1234” x 1234" x 454" 51% lbs. D-231 1434" x 1434" x 5” 614 lbs. D-531 1634” x 1634" x 534” 814 lbs. Duplexalite Shades and Accessories are shipped in individual cartons. Twenty-four pale hte seas eek Ft