Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 312
contact with aspring, makes contact in the battery circuit, and so makes thetwo electro-magnets. Griscombs Motor is a modern form of motor, weighing onlytwo or three pounds, and capable, when worked with four orfive Grove cells, of turning a sewing-machine, or a small saw. chap, v.] Electro-… … Ftg. 1 two opposite edges of the iron being north and south polarwhen the current is passing. The inner coil is furnishedwith a commutator, which reverses the current as soon as
Electricity
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