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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 421

An illustration from 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, leaf 421
Fig. 8L). Complete Photometer with Lummer-Brodhun Screen are arranged so that they can be reversed readily and two readingsshould always be taken to compensate for any inequalities in the sidesof the screen and the reflecting surfaces, a mean of the two readings 377 114 ELECTRIC LIGHTING serving as…

Electrical engineering

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