Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity . connected with a bent bar moving in an uprightdouble helix, is represented in Fig. 124. The mo-tion of the beams is communicated to a single fly-wheel, by means of toothed wheels moved by Single Beam Axial Engine. — Fig. 125represents an instrument in which a reciprocat-ing motion is communicated to a horizontal beam,by the alternate movement of two bent bars. Theiron bars are not attached to the ends of the beam,but simply rest upon them.
Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity . connected with a bent bar moving in an uprightdouble helix, is represented in Fig. 124. The mo-tion of the beams is communicated to a single fly-wheel, by means of toothed wheels moved by Single Beam Axial Engine. — Fig. 125represents an instrument in which a reciprocat-ing motion is communicated to a horizontal beam,by the alternate movement of two bent bars. Theiron bars are not attached to the ends of the beam,but simply rest upon them. When the currentpasses, one of the bars is lifted, and the weight of 184 DAVISS MANUAL. the Other depresses that extremity of the beam onwhich it rests. There is a break-piece of peculiar cou- Fig. struction at B, by means of which the current isahernately transmitted to each of the double Dr. Page is due the invention of the first instru-ments in which the source of motion was the axialforce exerted by helices on either straight or bentbars of iron. 295. Electro-Magnet. — A bar of iron, woundwith insulated wire, so as to be enclosed in a he^lix, is termed an the passage of an electriccurrent along the wire, the barexhibits a remarkable degree ofmagnetic power, far superior tothat of a steel magnet of thesame size. In all the instrumentsin which a current is transmittedthrough a coil surrounding an ironbar, the iron becomes temporarily an electro-magnet. Fig. 126.
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectmagnetism, bookyear18
