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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 141

An illustration from Light, photometry and illumination : a thoroughly rev. ed. of ''Electrical illuminating engineering'', 1912, leaf 141 — Fig. 60.—The Bechstein form of Weber photometer. Another modification of the Weber photometer known as theBechstein form is shown in Fig. 60. A translucent plate Areceives the light to be measured and is viewed through the op-tical device H and the prism B. The comparison lamp C is abenzine lamp in… … Fig. 61.—Martens photometer (horizontal section).

Light · Photometry · Electric lighting

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