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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 90

An illustration from Electrical instruments and testing; how to use the voltmeter, ohmmeter, ammeter, potentiometer, galvanometer, the Wheatstone bridge, and standard portable testing sets, 1907, leaf 90
g system in Fig. 55. The am-meters below 500 amperes total scale are series,the entire current passing through the instrument.Although the above type may be used on direct VOLTMETERS AND AMMETERS. 67 current circuits, the manufacturers recommendthe Thomson astatic form for such circuits. The… … Fig. 56. passes the current to be measured and also twopieces of magnetic metal. The field magnets are electromagnetic, not per-manent, as in the DArsonval instruments. An astatically arranged magnetic field is mount- C8 ELECTRICAL INSTRUMENTS. ed perpendicularly to the shaft and restrains…

Electric testing · Electric apparatus and appliances

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