Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1903)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 308
roportional to thepower in watts delivered to the circuit during that time. Themovable coil or armature revolves between twro stationary coilsAvith its axis at right angles to the axes of these coils, as shownin Fig. 257, where the meter cover is removed. The mova-ble coil, Fig. 258, is a… … Fig. 257.—Thomson Recording Wattmeter with.Case Removed. 290 PRACTICAL ELECTRICITY. contacts or brushes, B. A worm, S, on the upper end of thearmature shaft engages a set of wheels which records the watt-hours on a dial. The armature is very light and delicatelypoised between jewel centres, so that…
Electricity · Magnetism
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