Practical applied electricity; a book in plain English, for the practical man. Theory, practical applications and examples (1911)
Moreton, David Penn, 1882- · Chicago, The Reilly & Britton co · leaf 165
cups, as in theprevious case. A balance is obtained by turning the torsionhead until the needle that is attached to the movable coil isindicating no deflection, the reading of the pointer attached tothe torsion head is then noted and represents the indication ofthe instrument. The scale of the… … Fig. 114 ELECTEICAL INSTRUMENTS 155 in watts can be read directly from it. The general appearanceof the instrument is shown in Fig. 114. 163. Weston Wattmeter.—The principle of this instrumentis practically the same as the one described in the previoussection. No torsion head, however, is used and…
Electrical engineering
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