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 155
R A Sourc* o^HltXT, Fig. SO. The operation to be performed here is the check-ing of a voltmeter. 5 C is a standard cell, .4 one arm of the bridge,R the rheostat. A key and shunt are in the galvanometer circuitand a key or switch in the power circuit. Thelatter may be a tap from a direct current… … Layout of Fig. 80. THE POTENTIOMETER. 133 storage battery. But a few lamps or other resist-ance should be put in circuit to avoid danger ofexcessive current. The standard cell negative terminal is connectedto C and the positive terminal to a movable plugwhich for the present is placed in the 100…
Electric testing · Electric apparatus and appliances
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