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 63
cale as thevane turns. The vaneturns when the coil isenergized, as the ironvane tends to enter moreand more into the mag-netic field of the coil tohelp accommodate thelines of force passing through it. A flat spiral spring ofhighly tempered phosphor-bronze, mounted upon the axle,returns the needle… … Fig. 72. — Thomson Inclined Coil Ammeter. 42 EXPERIMENTAL ELECTRICITY resisted by a friction damping device operated by a smallpush button. The whole instrument, Fig. 72, is quite lightand is inclosed in a gun-metal case; owing to its lack ofpermanent magnets it retains its calibration over a…
Electricity · Electrical engineering
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