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 137
nal and one coil a portion of this wire is extended to form aslide wire, and a scale is arranged to indicate the position of thecursor on this wire. The coils have such a resistance that whenthe lamp is receiving its proper current its resistance will besuch that the balance point of the bridge… … Fig. 57.—The small Sharp-Millar photometer. convenient means of detecting the point of balance of the bridge,a low-resistance telephone receiver is used. In series with thereceiver is an interrupter consisting of a wheel into the peripheryof which pieces of insulating material have been set at…
Light · Photometry · Electric lighting
Internet Archive · Boston Public Library · Public Domain Mark 1.0. Free to use for anything.
