A text-book on chemistryFor the use of schools and colleges . GALVANIC EXPERIMENTS. 147 LECTURE XXIX. Voltaic Electricity.— GalvanVs Discovery.— TheSimple Voltaic Circle and its Properties.—Directionof the Current.—Different Kinds of Combinations.— Use of the Sulphuric Acid.— Cause of the VoltaicCurrent. In 1790 Galvani observed that if metallic communi-cation is made between the muscles and nerves of a re-cently killed frog, convulsive movements occur. If twodifferent metals are Fig. us. used, as copper andzinc, the contrac-tions are muchmore energetic. Ifthe crural nerve,JSTy Fig. 115, of af
A text-book on chemistryFor the use of schools and colleges . GALVANIC EXPERIMENTS. 147 LECTURE XXIX. Voltaic Electricity.— GalvanVs Discovery.— TheSimple Voltaic Circle and its Properties.—Directionof the Current.—Different Kinds of Combinations.— Use of the Sulphuric Acid.— Cause of the VoltaicCurrent. In 1790 Galvani observed that if metallic communi-cation is made between the muscles and nerves of a re-cently killed frog, convulsive movements occur. If twodifferent metals are Fig. us. used, as copper andzinc, the contrac-tions are muchmore energetic. Ifthe crural nerve,JSTy Fig. 115, of afrog be exposed and connected with lISlljEzI-.! - —« a piece ot zmc, Z, while, the muscles of the thigh, m, are touched with acopper wire, (7, nothing occurs as long as the metals arekept apart; but, as soon as they are brought into con-tact* ia convulsive movement ensues, and the same is re-peated as often as the contact is made. These phenom-ena at first went under the name of animal electricity. If a piece of zinc and one of silver be place
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