Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity . is obtained by thefollowing arrangement: One endof the wire composing the coilconnects with one of the screw-cups on the stand, and its otherend with the bearings of theshaft on which the needle re-volves. On the shaft is a break-piece, seen at B, in the frontview of the needle, given sepa-rately in the cut, upon which awire, W, connected with the other screw-cup, pressesduring half of the revolution. The instrument maybe used as a galvanometer, by re
Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity . is obtained by thefollowing arrangement: One endof the wire composing the coilconnects with one of the screw-cups on the stand, and its otherend with the bearings of theshaft on which the needle re-volves. On the shaft is a break-piece, seen at B, in the frontview of the needle, given sepa-rately in the cut, upon which awire, W, connected with the other screw-cup, pressesduring half of the revolution. The instrument maybe used as a galvanometer, by removing W from thebreak-piece, and bringing it into contact with a silverpin, not shown in the cut, which connects it directlywith the coil, without the intervention of the break-piece. If the direction of the battery current is re-versed, the needle revolves in the opposite direction. 195. Revolving Coil and Magnet, — In this in-strument, represented in Fig. 73, a circular coil ofwire, C, is fitted to revolve, on a vertical axis, betweenthe poles of two steel magnets. So far it resemblesin principle the Revolving Coil (Fig. 69); but in. REVOLVING COIL AND MAGNET. 123
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectmagnetism, bookyear18
