Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity . hem. At B, on theshaft of the wheel, but not insulated from it, is thebreak-piece, consisting of a small metallic disc, fromwhich project, in a lateral direction, several pins, equal in number to the iron bars; orthe disc may be furnished witha corresponding number of silver spring connected withone end of the wire surroundingthe electro-magnet, plays uponthese pins or teeth; the otherend of this wire is soldered tothe iron of the magnet, whic
Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity . hem. At B, on theshaft of the wheel, but not insulated from it, is thebreak-piece, consisting of a small metallic disc, fromwhich project, in a lateral direction, several pins, equal in number to the iron bars; orthe disc may be furnished witha corresponding number of silver spring connected withone end of the wire surroundingthe electro-magnet, plays uponthese pins or teeth; the otherend of this wire is soldered tothe iron of the magnet, whichbrings it into metallic commu-nication with the shaft by meansof the brass plate and the wire may be terminatedby a second spring pressing upona cylindrical part of the axis. 332. The break-piece is ar-ranged in such a manner, that theelectro-magnet is charged whenany one of the iron bars is brought near it by the mo-tion of the wheel. This bar is then attracted towardsthe poles; when it arrives at the plane of the mag-net, the current is cut off, in consequence of the cor-responding pin or tooth releasing the silver spring18*. 210 D AVI S S MANUAL. from its bearing. The armature being no longerattracted, the wheel moves on by its momentumuntil the next bar comes into the same position,causing the magnet to be recharged; this is thenattracted in its turn, and passes on like the preced-ing one. 333. The spring playing on the break-piece mustbe so disposed that the circuit shall be broken wheneach bar reaches the poles, and not be renewed againuntil it has passed to a greater distance from themthan that between the next succeeding bar and thepoles, or it will be attracted back again, preventingthe continuance of the motion. 334. Vibrating Armature Engine. — Fig. 144represents an instrument in which the armature, A, is made to vibrate backwardsand forwards above the polesof an electro-magnet, M. Thearmature, when on one side, isattracted by the poles until itarrives
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectmagnetism, bookyear18
