Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity . e galvanic current inthe coil from the copper to the zinc. 186. Take a bar magnet, M, and, holding it hori-zontally, bring its north pole near to the south poleof the ring. The ring will move towards the mag-net, and pass over it until it reaches its middle, whereit will rest in a state of equilibrium; returning to thisposition, if moved towards either pole and then leftat liberty. Now, holding the ring in its position,withdraw the magnet, and pass it
Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity . e galvanic current inthe coil from the copper to the zinc. 186. Take a bar magnet, M, and, holding it hori-zontally, bring its north pole near to the south poleof the ring. The ring will move towards the mag-net, and pass over it until it reaches its middle, whereit will rest in a state of equilibrium; returning to thisposition, if moved towards either pole and then leftat liberty. Now, holding the ring in its position,withdraw the magnet, and pass it again half waythrough the coil, but with its poles reversed. Thering, when set at liberty, will, unless placed exactlyat the centre, move towards the pole which is near-est, and, passing on till clear of the magnet, willturn round and present its other face. It will thenbe attracted, and pass again over the pole till it restsin equilibrium at the middle of the magnet. 187. Yi-BRATiNG CoilEngine.— Inthe instru-ment repre-sented inFig. 66, twoheliacal coilsare so sus-pended froman arm at-tached to thetall brass pil-lar as to al- Fig. VIBRATING COIL ENGINE. 117 low of their moving to some distance over the poles,N and S, of a steel magnet. When uninfluenced bythe electric current, the coils hang vertically fromtheir points of support. There are two cranks onthe axis of the balance-wheel above the magnet, whichconvert the vibration of the coils into opposite sides of the axis are tvv^o wires, tippedwith silver springs ; each of these is connected underthe base-board with one end of the wire forming eachcoil. At the point where the springs press, a part ofthe axis is cut away, leaving a third or a quarter ofthe cylindrical surface prominent; over this is sol-dered a thin slip of silver. The effect of this arrange-ment, which is called a breok-piece, is, that eachspring alternately transmits the electric current fromthe axis to its coil during a part of the revo
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectmagnetism, bookyear18
