Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 64
Fig. 3.—Large Industrial Colour-matching Units used in a Silk Store. … Fig, 4.—A largo portable Colour-matching Unit as used in Purchasing Goods. 54 THE ILLUMINATING ENGINEER (feb. 1920) standard reflectors, but are also used ingroups in a very artistic manner forgeneral lighting in stores. The noon-sunlight units provide a quality of lightapproximating to…
Lighting
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