Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. (1916)
American Technical Society · Chicago : American Technical Society · leaf 425
noted by a constant C, when we have the formula C corresponds to a particular plate at g;l is distance of screen / fromthe benzine lamp; and L is distance from the screen g to the lightsource being measured. Screens of different densities m.ay be usedat g depending on the strength of the light… … Fig. 90. Sharp-Millar Photometer being considered. Readings of the screen / are taken as before, Acalibration curve is plotted for the instrument, using a known lightsource at a known distance from the white screen when the instru-ment is mounted in a dark room. Portable Photometers. There is a…
Electrical engineering
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