Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity . is suspended over a small basin for con-taining mercury ex-cavated in the stand,by means of a brassarm supporting a mer-cury cap, in whichthe upper end of thewire rests: this modeof suspension allowsit to vibrate freely,if its upper end isproperly bent. Twocups for connectionwith the battery com-municate, one with, the mercury in the excavation,the other with the cup which sustains the wire. 176. The basin being supplied with a sufficientquantity of m
Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity . is suspended over a small basin for con-taining mercury ex-cavated in the stand,by means of a brassarm supporting a mer-cury cap, in whichthe upper end of thewire rests: this modeof suspension allowsit to vibrate freely,if its upper end isproperly bent. Twocups for connectionwith the battery com-municate, one with, the mercury in the excavation,the other with the cup which sustains the wire. 176. The basin being supplied with a sufficientquantity of mercury to cover the lower end of thesuspended wire, lay a horseshoe magnet in a hori-zontal position on the stand, with one of its legs oneach side of the wire. When communication isestablished with the battery, the poles of the magnetwill conspire in urging the wire either backwards oiforwards between them, according to the direction inwhich the current flows through it, and the positionof the magnetic poles. In either case, the motionwill carry it out of the mercury into the positionshown by the dotted lines in the cut; and the circuit. ^aii^A«t!iM»4taf;;^s^i^^^^^^^ VIBRATING WIRE. Ill being thus broken, the wire will fall back by its ownweight; when, the current being reestablished, itwill again quit the mercury, as before, and a rapidvibration will be produced. The vibration may bemade somewhat more active by raising the magnet alittle from the stand, and nearly to the height of themiddle of the wire. 177. The instrument represented in Fig. 62 diifersfrom the one last described in the mode of suspen- Fig. 62. sion of the wire and the verti- cal position of the magnet. Thewire is fixed to a little cylinder,moving freely on a horizontalaxis, which is supported by abrass pillar, secured upon oneof the magnetic poles. A smallmercury trough, supported be-tween the legs of the magnet,is connected, under the stand,with one of the the current is conveyedto the mer
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectmagnetism, bookyear18
