Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity . shall be passing between the oppositepoles at the same time. They are made to revolverapidly by a multiplying wheel, as in Fig. 173. Apole-changer on the shaft conveys the alternatingcurrents in a constant direction to the screw-cupswith which the metallic handles are shov/n in con-nection. 453. For giving shocks, the small wheel on theshaft is set with vertical pins, upon which plays aniron or steel wire connected with one of the screw-cups. Brillian
Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity . shall be passing between the oppositepoles at the same time. They are made to revolverapidly by a multiplying wheel, as in Fig. 173. Apole-changer on the shaft conveys the alternatingcurrents in a constant direction to the screw-cupswith which the metallic handles are shov/n in con-nection. 453. For giving shocks, the small wheel on theshaft is set with vertical pins, upon which plays aniron or steel wire connected with one of the screw-cups. Brilliant sparks are seen as the wire passesover the pins. These sparks are sometimes half aninch in length. The shocks are stronger than withthe machine last described, and the decomposingpower considerably greater. vibrating elect rotome. 279 454. Magneto-Electric Machine, with Electrotome.—III this form, the circuit is notinterrupted by the motion of the machine itself, forgiving shocks; but the vibrating electrotome, whichwill be described immediately, is attached for thatpurpose, as represented in Fig. 175. The shocks Fig. are of more uniform strength with this interruptoithan with the mechanical one, as they occur onlywhen the primary current charges the electro-magnetsufficiently to draw down its armature. For sparks,decompositions, &c., the primary current can be usedwithout passing it through the coil of the electro-tome. This is effected by turning the screw S, soas to raise the platinum point from the spring attachedto the armature. 455. Vibrating Electrotome.—In Pig. 176,the vibrating electrotome is shown in a form adapt-ed for use with either of the machines described in 452. There is an electro-magnet, of theU form, enclosed in a helix consisting of severallayers of coils. Above this is a straight armature, 280 DAVISS MANUAL. Fi^. ]76.
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectmagnetism, bookyear18
