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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. 61.—Martens photometer (horizontal section). … Fig. 62.—Martens photometer (vertical section). PORTABLE PHOTOMETERS 127 the light transmitted by this plate is reflected by the prism Fand is received at the eye-piece through the prisms B. Thisphotometer may be calibrated similar to the Weber and its rangecan be extended by increasing the density…

Light · Photometry · Electric lighting

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