Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 325
s it passes, according to the will of the distantoperator (Fig. 200). The coil of paper on the vertical wheel is U 3o6 Electricity. Book m. shown at A, and B, C are the friction rollers between which itpasses by the action of the clockwork in the case (D), whichcan be started or stopped at will by… … Fig. 200. from 50 to 500 ohms, according to the conditions of thecircuit. Opposite the poles of the electro-magnet is a soft ironarmature carried on a brass lever, which turns round a pivot,and has its motion upwards checked by a screw (a), againstwhich it is held when no current is passing by a…
Electricity
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