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 106
AFig. 36.Figs. 35 and 36.—The Bechstcin photometer. light from the right-hand side of the wedge and the right-handportion receiving light from the left side of the wedge. Theinfluence of the prism Z^ is the same as Z^ except that it is 90degrees displaced. The result is that the field of view is…
Light · Photometry · Electric lighting
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