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 381
bridge. Fig. 50, represent a ratio factor which is multiplied into Pto give X, the unknown resistance. These multiplying factors are 344 ELECTRICAL MEASUREMENTS 49 provided, in this form of bridge, by the dial shown above the gal-vanometer which makes possible the use of multipliers from .001… … Fig. 53. Diagram of Leeds and Northrup Testing Set For example, the resistance in P, Fig. 53, is 6739 ohms and the mul-tiplier is .01. The galvanometer, the needle and scale of which areshown at the left, is of the portable DArsonval type, and the coil ismounted in jewels. As this galvanometer is…
Electrical engineering
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