Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity . 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
Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity . 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^. ] fixed to a spring, by which it is held up from thjpoles. The screw-cups at one extremity of the base board are to be connectedwith the cups of the ma-chine, and those at the otherend with the handles forshocks. The primary mag-neto-electric current is pass-ed through the helix, and a^^ *^ secondary obtained by inter- rupting the circuit by the movement of the arma-ture. One screw-cup at each extremity of the standconnects with one end of the helix, which consistsof a rather long single wire, and the other two cupswith the pillar to which the armature is fixed. Theshock is thus obtained from the same wire whichconveys the primary current. 456. When the machine is put in motion, theelectro-magnet is instantly charged, and draws downits armature. This motion depresses the spring, andseparates a little platinum disc upon it from a pointof the same metal attached to a set screw, S, abovethe spring. On the interruption of the circuit, thearmature is raised by the force of the spring. A thin
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectmagnetism, bookyear18
