A dictionary of electrical words, terms and phrases (1896)
Houston, Edwin J. (Edwin James), 1847-1914 · New York, The W.J. Johnston company · leaf 412
s shadow on a screen ofwhite blotting paper B. A standard candle,placed in the holder D, casts its shadow alongsidethe shadow cast by the electric light. The lensis now displaced until the shadow of the electriclight is of the same intensity as that of the candle,when viewed successively through… … Fig. 42g. Ayrton and Perrys Dispersion Photometer* (6.) Selenium Photometers. — Instruments irewhich the relative intensities of two lights are de-termined by the variations produced in a seleniumresistance. In Siemens Selenium photometer a seleniumcell is employed in connection with an…
Electricity · Electrical engineering
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