Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 228
he lamp.If the bulb be placed in the usual position,with the point downwards, a considerableamount of light is reflected from thetop of the interior of the lamp or fromthe mica disc employed in some of thegas-filled bulbs. If this light emergesmixed with the reflected light from theshade it… … Fig. 1.—Showing the use of Daylight Unit FiG. -•— Use of Artificial Daylight Unit (Xo. (No. 850) to facilitate grading of wheat 850) over artists desk (Sun Engraving Co., (Messrs. Vernon & Co., Ltd.,Cunard Build- Watford),ings, Liverpool).
Lighting
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