Light, photometry and illumination : a thoroughly revedof ''Electrical illuminating engineering'' . reas receiving the greatestillumination. The vertical distribution of light through thecenter of the surface is represented by the broken line at the sideof the diagram. See also Figs. 153, 160 and 191. The Effect of Light Colored Ceiling, Walls and Floor onIllumination.—As stated at the beginning of the chapter, thepoint-by-point methods are applicable only to those classes ofservice where the illumination is not increased by reflection from 186 LIGHT, PHOTOMETRY AND ILLUMINATION surrounding ob
Light, photometry and illumination : a thoroughly revedof ''Electrical illuminating engineering'' . reas receiving the greatestillumination. The vertical distribution of light through thecenter of the surface is represented by the broken line at the sideof the diagram. See also Figs. 153, 160 and 191. The Effect of Light Colored Ceiling, Walls and Floor onIllumination.—As stated at the beginning of the chapter, thepoint-by-point methods are applicable only to those classes ofservice where the illumination is not increased by reflection from 186 LIGHT, PHOTOMETRY AND ILLUMINATION surrounding objects or surfaces such as the ceiling and walls of aroom. AVhen the ceiling, walls, or floor of a room are light incolor, the illumination will be increased by a greater or less amountdepending upon the distribution of light from the source orsources and the reflecting power of the different parts of theinterior. Investigations of the effect of reflection and interaction oflight colored ceiling, walls, and floor, were carried out by Lan-singh and Rolph^ under actual conditions. The room which. Fig. 109.—Representation of illumination values. they used for the tests was about 24 by ft. and 10 ft. green burlap and dark green rugs were used for the darkfinish, and light cream colored wrapping paper constituted thecovering for the light surface. The lamps were placed close tothe ceiling. Tests were run 1. 1 bare lamp. 2. 1 lamp with an extensive prismatic reflector. 3. 3 bare lamps—distributed. 4. 3 lamps with extensive prismatic reflectors. And eight light surveys were run for each lighting equipmentwith the following combinations: ^ 1. Ceiling, walls, and floor dark. 2. Ceiling light, walls and floor dark. 3. Ceiling and walls light, floor dark. Trans. Ilium. Eng. Soc, Vol. 3, p. 584, 1908. ILLUMINATION CALCULATIONS 187 4. Ceiling, walls and floor light. 5. Walls light, ceiling and floor dark. 6. Walls and floor light, ceiling dark. 7. Floor light, ceil
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectlight, bookyear1912
