A text-book on chemistry : for the use of schools and colleges . depositiontook place, and, in turn, it. may be used as a mould forobtaining a great number of casts. Gilding, silver-plating, and platinizing are now performed on the sameprinciples, the electrotype being one of the most beauti-ful contributions which science has of late given to theaits. An instrument, the Voltameter, has been invented byFig. 117. Mr. Faraday for measuring quantities of Voltaic electricity. It is represented inFig. 117. It consists of a glass jar, b,filled to the height d with water, andthrough its cover, c, a g
A text-book on chemistry : for the use of schools and colleges . depositiontook place, and, in turn, it. may be used as a mould forobtaining a great number of casts. Gilding, silver-plating, and platinizing are now performed on the sameprinciples, the electrotype being one of the most beauti-ful contributions which science has of late given to theaits. An instrument, the Voltameter, has been invented byFig. 117. Mr. Faraday for measuring quantities of Voltaic electricity. It is represented inFig. 117. It consists of a glass jar, b,filled to the height d with water, andthrough its cover, c, a graduated tube, a,passes. In the lower part of the tube atg, two pieces of platina foil, which formthe terminations of the polar wires of thebattery, the current of which is to bemeasured, are introduced, the connectionwith those wires being made by the aid ofthe mercury cups, ef. The tube, a, havingbeen filled with water, as soon as the cur-rent passes decomposition takes place, thegases collecting in the graduated tube, and measuringthe amount of the Describe the Voltameter. VOLTAIC BATTERIES. 131 LECTURE XXXI. Ohms Theory of the Voltaic Pile.—Magnetism and E l EC r RO-MAGN ETISM.— Vo/ta s Pile.—11a res Ca/o/i mo-tor.—Zambonis Pile.— Ohms Theory —Electro-motiveForce.—Resistance.—General Law for the Force of theCurrent.—Laws and Phenomena of M gnetism—Elec-tro-magnetism, Oersteds Discoveries in.— The Galvan-ometer.—Electric Rotations.— Tangential Force.—Elec-tro-magnets. With a given amount of metallic surface we can pro-duce Voltaic batteries having different qualities. Thus,if we take a square foot of copper and a square foot ofzinc, and place between them a piece of wet cloth, weshall have a battery which can not give shocks, nor effectthe decomposition of water, but which will cause a finemetallic wire to become white hot, or even to fuse. If,aaain, we take a square foot of copper and a square footof zinc, and cut each into 1
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