Electricians' operating and testing manual; (1910)
Horstmann, Henry C. [from old catalog], Tousley, Victor Hugo, 1875- [from old catalog] joint author · Chicago, F. H. Drake & co · leaf 257
alternating current cir-cuits. An outer coil C is wound on a circular form.Inside of this coil, mounted on jewel bearings, is amovable coil C. Two spiral springs convey the cur-rent to the movable coil and restrain its motion. Thetwo coils are connected in series. When current flowsthrough the… … Figure 158 as though direct current wras used. The instrument isdamped by a metal vane moving in a partly closed airchamber. The difference between a voltmeter and an ammeteris merely a difference in winding. A voltmeter iswound with a very fine wire and registers the differ-ence in pressure…
Electrical engineering · Electric testing
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