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 423
Fig. 88. Weber Portable Photometer small opening toward the screen. If the lights are properly screened,photometric measurements may be made in rooms having light-colored walls. sis … o w w Q >o O o UJ sH § ^1H ^W . W li. wo 03 ELECTRIC LIGHTING 115 Weber Photometer. As an example of a good portabletype, the Weber photometer is shown in Fig. 88. This photometeris very compact and is especially adapted to measuring intensityof illumination as well as the value of light…
Electrical engineering
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