Twentieth century handbook for steam engineers and electricians, with questions and answers; a practical nontechnical treatise .. (1916)
Swingle, Calvin F. (Calvin Franklin), b. 1846 · Chicago, F.J. Drake & company · leaf 1349
t currentonly. The company makes an alternating current volt-meter but no ammeter. Thomson Astatic instruments arefor direct current. The Thomson Inclined Coil in portable,or edgewise switchboard form is for alternating current. Wattmeters.—By combining two coils, one movable, theother stationary,… … Fig. 618thomson inclined coil instrument The recording wattmeter records watt-hours. A watt-hour is one watt of power used for an hour, or any combina-tion like one-quarter of a watt for four hours, etc. The Thomson Eecording Watt-Hour Meter is used fordirect, or alternating current. It is shown…
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