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Publication numberUS883944 A
Publication typeGrant
Publication dateApr 7, 1908
Filing dateDec 8, 1904
Priority dateDec 8, 1904
Publication numberUS 883944 A, US 883944A, US-A-883944, US883944 A, US883944A
InventorsWalter C Fish
Original AssigneeGen Electric
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Electric lighting.
US 883944 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

PATETED APR., 7, 1908.

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-To-all whom 'it may concern:





' Specification of Letters Patent.

Eatented April 7, 1908.

Application filed December v8, 1904. I Serial No. 236,046.

Be itknowiithat I, WALTER C. FisH, alpcitizen of the Umted States, residing at Lynn,

in the county of Essex, State of Massachusetts, have invented certain new and useful Improvements in Electric Lighting, of which' the following is a specification. Y

The light given oit by mercury. va or. lamps is particularly strong in blue rays ut noticeably deficient in" red and yellow rays, and the consequence is that when such lamps are used Yfor purposes of illumination there is practically a` total elimination of the red and yellow colors from the objects illuminatedf This characteristic of the mercury vaporlamp .is a source of objection to its general adoption for purposes-of illumination where color values are of im ortance.

provide a means where y li ht rich in red and yellow rays may be com ined with the blue light from a mercury-vapor lamp-or other source decient in such rays, therebyy producing a resultant beam with proper pro` portion of the various solar colors.,` To this end I project the light ofthe mercury vapor lamp u on a glass or other light'transmittingA re ector-in such a way that the reflected rays mingle with light passed directly through the light-transmitting reflector from a source located on the opposite side.

Y Figure 1 is asectional view showing the arrangement of the light-transmitting reflector and the two light sources; Fi 2 is an elevation of the same with certain of-'the parts The mercury arc lamp or other vapor elecl tric lamp 1 is suitably sup orted and' concealed by the refiector 2 Whic is secured by a bracket'S to a vertical surface, as for in stance the' side wall of a room. A light-A transmitting refiector 4 of glass or other hght-transrnitting material is mounted above the va orv electric lamp in osition to reflect .the lig t from the lamp an its reflector 2 to- 8, or other sources of light capable ofyielding 'red and yellowrays, or other rays suitable for blending with the light from va or electric lamps, are located above the lig ttransmitting reiiector'or on the side op osite from that occu ied by the 'vapor -e ectric lamp of tubular form, it vis obvious that a It 1s the object of t e resent invention to pluralit of these lamps might be arranged along t e wall of the room, and if desired -might completely encircle it, vthus producing an even distribution of the light throughout the room and securing the advantage of the high light efficiency of the mercurylamp without` subjecting the occupants of the room to the annoyance of, unnatural color effects usually incident to illumination withv mercury vapor lamps. The reflector 2 comletely conceals the mercury vapor lamp om below, so that the flickering and pulsating ordinarily occurring in such lamps is not 'A plurality of incandescent lights 6, 7 and.

large area where an even distribution of the i light and complete freedom from shadows is desired.

What I claim as new and desire to secure by Letters Patent of the United Statesis,

l. The combination, with a source of illumination yielding light deficient in some of the solaricolors, of means for shielding the area to be illuminated from the direct rays from said source, means for refiecting said light on saidarea, and means for combining .with said refiected light the 'light from a source capable of supplying said deficient solar colors. Y

- 2. The combination, with a vapor electric lamp, of a lighttransmitting reflector therefor, and means for'projecting li ht .through said ref i'ector to combine with t e reflected light from said vapor electric lamp.

3. The combination, with an electric lamp, of a light-transmitting reflector therefor, and a source of light having a color Value different from that of said electric lamp and located back of said reflector, the light rays from said source passing through rsaid reflector and mingling with the light from said electric lamp.

4. The combination, With a vapor electric lamp, of a light-transmitting reflector located in proximity thereto and at such an anglel that light from said vapor electric lainpwill be reflected by said reflector, and means for projecting light of a dierent color value through said reflector to combine With the reflected light from said vapor electric lamp. 5. The combination,.with a tubular electric lamp, of an opal reflector arranged substantially parallel thereto and adapted to Vreiect light from said tubular lamp, and means for projecting li ht through said reflector to combine with te reflected light lfrom said i tubular lamp.

In witness whereof I have hereunto set my hand this fifth day of December 1904. WALTER C. FISH. Witnesses:


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3334217 *Apr 12, 1962Aug 1, 1967Hoffman Electronics CorpSimulation of solar radiation
US3536905 *Sep 7, 1967Oct 27, 1970British Lighting Ind LtdArtificial sun-bathing enclosure
US5059146 *Feb 22, 1990Oct 22, 1991Welch Allyn, Inc.Method of adjusting a light source for color temperature and chromaticity
Cooperative ClassificationF21V9/02