Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity . ) 171. In the case of a con-ducting wire revolving rounda magnet, the circumstanceof the two being joined to-gether does not affect the re-sult, the wire moving withsufficient power to cause themagnet to turn on its axiswith considerable rapidity,when delicately supported : abar magnet is of course em-ployed. A figure and descrip-tion of an instrument designedto show this revolution willbe found in Sillimans Journal, Vol. XL. p. 111. 172. The current
Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity . ) 171. In the case of a con-ducting wire revolving rounda magnet, the circumstanceof the two being joined to-gether does not affect the re-sult, the wire moving withsufficient power to cause themagnet to turn on its axiswith considerable rapidity,when delicately supported : abar magnet is of course em-ployed. A figure and descrip-tion of an instrument designedto show this revolution willbe found in Sillimans Journal, Vol. XL. p. 111. 172. The current passing within the voltaic bat-tery itself exhibits the same electro-magnetic prop-erties that it does while flowing along a conductingwire connecting the poles. Hence the battery, ifmade small and light, will revolve by the influenceof a magnet. This is effected in the followingmanner. 173. Rotating Battery. — A small double cylin-der of copper, closed at the bottom, is supported uponthe pole of a magnet, by means of an arch of copperpassing across the inner cylinder, and having a pivotprojecting downwards from its under surface, which. ROTATING BATTERY, 109 rests in an agate cup on the pole. The inner cylin-der of course has no bottom. A cyhnder of zinc isFi<^ GO supported by a pivot in a similar manner upon the copper arch,and, being intermediate in sizeS between the two copper cylin-k.« ders, hangs freely in the cell. This arrangement allows eachplate to revolve independently ofthe other. In Fig. 60 two bat-teries are represented, one on eachpole of a U-magnet, the one onthe south pole being shown insection; in tliis the zinc platez is seen suspended within thecopper vessel. 174. On introducing dilutedacid into the copper vessel, an electric current imme-diately begins to circulate, which passes from thezinc to the copper through the acid, and, ascendingfrom the copper through the arch, descends again tothe zinc. Hence the zinc plate is in the condition ofa conductor
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectmagnetism, bookyear18
