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 430
Fig. 95. Station Photometer moving on a suitable scale, and the lamp holders, one for the stand-ard, the other for the lamp to be tested, are mounted at the ends ofthis scale. There are several types of so-called station photometersarranged so as to be very convenient for testing incandescent… … Fig. 96. Portable Photometer for Incandescent Lamps incandescent lamps. The length of scale should not be less than100 centimeters, and 150 to 200 centimeters is preferred. This scalemay be divided into centimeters or, for the purpose of doing awaywith much of the calculation, the scale may be a…
Electrical engineering
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