Light, Photometry And Illumination : a Thoroughly Rev. Ed. of ''electrical Illuminating Engineering''

Cover Light, Photometry And Illumination : a Thoroughly Rev. Ed. of ''electrical Illuminating Engineering''
Light, Photometry And Illumination : a Thoroughly Rev. Ed. of ''electrical Illuminating Engineering''
William Edward Barrows
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The light falling on either side of the screen is partly reflected and partly absorbed, while that falling on the treated part is partly transmitted. If the same per cent, is absorbed by both parts of the screen, a greater amount will be reflected from the untreated part. When the illumination on both sides of the screen is the same an equal amount of light is transmitted through the treated portion in each direction and if the light from each 0] Fig. 30. — The Elster-Joly diflfusion photometer....
source is of the same hue both sides of the translucent portion of the screen, should appear identical. If the same per cent, of light be absorbed by both the treated and untreated portions of the screen, the entire surface of both sides of the screen will then appear identical when a photometrical balance is obtained, provided the color of the light from the two lamps is the same.
The coefficient of absorption of the translucent portion is, how- ever, usually greater than that of the untreated part and a con- trast is observed when a setting is secured.


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