Light, photometry and illumination : a thoroughly rev. ed. of ''Electrical illuminating engineering'' (1912)
Barrows, William Edward, 1878-1960 · New York ; London : McGraw-Hill Book Co. · leaf 223
Fig. 111.—Sporadical uniformillumination. … Fig. 112.—Uniform iilimiina-tion by overlapping straightillumination curves. formly illuminate a circular area as indicated in Fig. Ill, and theareas between the circles shown shaded in the figure wouldreceive no light. It follows, then, that the polar candle-power distribution mustbe modified and…
Light · Photometry · Electric lighting
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