Hiscox, Gardner Dexter, 1822?-1908 · New York, The Norman W. Henley publishing co. · leaf 213
757. ELECTRIC ROCK DRILL, General Electric Co.s model. A series of electric coils arefixed along the cylinder. The iron plunger traversesthe interior of the coils, which are charged succes-sively by the electric current through traverse brusheson a straight commutator. 202 ELECTRIC POWER AND… … 758. ELECTRIC FAN.—The motor isconcealed in the central chamber, the middlesection of which revolves with the arms.
Mechanical movements
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