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 36
in a later chapter. The Thompson Reflecting Galvanometer. In the Thompson reflecting galvanometer, a flat mirror ofless than one-half inch in diameter has a numberof fine steel magnets fastened on its back. Thismirror-magnet combination is suspended by afibre of cocoon silk inside a coil of many… … This scale has the zero mark in the centre, readingsbeing thus possible in either direction. 14 ELECTRICAL INSTRUMENTS. A compensating magnet is attached on a rodfixed to the top of the case and leveling screws areprovided to level the instrument. As the mirror is small and light it has…
Electric testing · Electric apparatus and appliances
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