Electrical instruments and testing; how to use the voltmeter, ohmmeter, ammeter, potentiometer, galvanometer, the Wheatstone bridge, and standard portable testing sets (1907)
Schneider, Norman H. (Norman Hugh), Hargrave, Jesse · New York, Spon & Chamberlain; [etc., etc.] · leaf 45
ty of upwards of onemegohm. It is dead beat and has a scale dividedfrom a central zero into 50 divisions right or left. As has been remarked before, instruments con-structed on the DArsonval principle read in directproportion to the current passing. 22 ELECTRICAL INSTRUMENTS. And they are not… … Fig. 15. Scale and Lamp. The oscillations of the gal-vanometer mirror are read in two ways. Bywatching a spot of light on a scale or observingthe image of the scale reflected in the mirror bymeans of a telescope. The scale is made in various forms but in prin-ciple resembles that in Fig. 15.…
Electric testing · Electric apparatus and appliances
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