. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . Fk;. 4.—Mortising chisel. MOTORS, ELECTRIC. 535 attraction botweeii two electro-magnets : (3) by analogous principles based upon tbe attract-ive force exliibited between masses of magnetic metal, and (4) the action of a magnet upona field of force created bv the passage of currents in neighboring conductors. To these mustbe added that small experimental class which depend for their action on the attraction andrepuls
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . Fk;. 4.—Mortising chisel. MOTORS, ELECTRIC. 535 attraction botweeii two electro-magnets : (3) by analogous principles based upon tbe attract-ive force exliibited between masses of magnetic metal, and (4) the action of a magnet upona field of force created bv the passage of currents in neighboring conductors. To these mustbe added that small experimental class which depend for their action on the attraction andrepulsion of statically charged surfaces. discovery by Oersted, that the magnetic needle could be deflected bythe passap-e of a current in proximity to it, was closely followed by that of Arago and Davy,who showed, independently of each other, that iron and steel could be magnetized by thepassao-e of a current through a wire wound around them. Sturgeon utilized this in the con-struction of the first powerful horseshoe magnets. These principles were soon applied tothe construction of elementary electric motors, among tiiem that of Barlow, known as Bar-lows wbeol.
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Keywords: ., bookcentury1800, bookdecade189, booksubjectmechanicalengineering
