Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1902)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 308
proportional to thepower in watts delivered to the circuit during that time. Themovable coil or armature revolves l:)etween two stationary coilswith 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 th^armature 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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