Electricity experimentally and practically applied; a book for the beginner and for the practical man, principles, experiments, practical applications and problems (1910)
Ashe, Sydney Whitmore · New York, D. Van Nostrand company · leaf 42
. 29, —Tele- magnetism will be strong and permanent,phone Receiver Herein lics a most important feature of the^ • • ■ ^^ instrument. A movable coil wound upon ametal shell is pivoted so that it will move freely over thecircular iron core without touching the pole pieces. Theair gaps aremade as… … Fig. 30. — Weston Speed Tachometers.
Electricity · Electrical engineering
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