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 42
Fig. 11. meter is entirely enclosed in a cylindrical case; themirror deflections being observed through a win-dow in front. A removable bracket carries a reading telescopeand scale so proportioned that it gives the same GALVANOMETERS. 19 effect as a standard millimeter scale at a distanceof one… … Fig. 12. The scale deflections are directly proportionalto the current causing them. The sensibility is about 500 megohms per voltof battery used, a sensibility sufficient for all or-dinary measurements. 20 ELECTRICAL INSTRUMENTS. In the Willyoung form of DArsonval galvano-meter the suspension of…
Electric testing · Electric apparatus and appliances
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