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 420
and absorbed by the black lining of the case. The field of light, asthen viewed through the telescope, appears as a disk of light pro-duced by the screen Li, surrounded by an annular ring of light pro-duced by L. When the illumination on the two sides of the screen 376 ELECTRIC LIGHTING 113 is the… … 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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