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 427
-power of thelight source, or some multiple of this candle-power. The range ofthis instrument is increased by the use of suitably arranged absorbingscreens which may be readily inserted or removed and, as ordinarilyequipped, the range in foot-candles is approximately from .004 to 381 118 ELECTRIC… … Fig. 92. Matthews Integrating Photometer of 8 pounds. Considering its compactness, this photometer iscapable of great accuracy. Integrating Photometers. Matthews. This photometer is usedto some extent and a very good idea of its construction can be 382 ELECTRIC LIGHTING 119 obtained from Fig, 92.…
Electrical engineering
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