Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 228
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). … Fig. 3.—Two - light Standard Fig. 4.—Matching artificial teeth by aid of model Xo. 615(Xo. 610) for use on shop- (Meagre. De Trey & Co., Ltd., London). counters. The small fitting contains an ordinary lamp thatcan be switched on for pur-poses of comparison. 218 THE ILLUMINATING ENGINEER (xov.…
Lighting
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