A text-book on chemistry : for the use of schools and colleges . LECTURE XXVIII. Voltaic Electricity.— Of Electricity in Motion.—Sul-zers Experiment.—Galvanfs Discovery.— Voltas The-ory.— Water is a compound Body.—Description of asimple Voltaic Circle and its Properties.—Direction ofthe Current.—Different Kinds of Combinations.— Use ofSulphuric Acid.— Origin of the Electricity. During the last century, a German author of the nameof Sulzer observed, that when two pieces of metal of dif-ferent kinds, as silver and zinc, are placed one above andthe other beneath the tongue, as often as their proj
A text-book on chemistry : for the use of schools and colleges . LECTURE XXVIII. Voltaic Electricity.— Of Electricity in Motion.—Sul-zers Experiment.—Galvanfs Discovery.— Voltas The-ory.— Water is a compound Body.—Description of asimple Voltaic Circle and its Properties.—Direction ofthe Current.—Different Kinds of Combinations.— Use ofSulphuric Acid.— Origin of the Electricity. During the last century, a German author of the nameof Sulzer observed, that when two pieces of metal of dif-ferent kinds, as silver and zinc, are placed one above andthe other beneath the tongue, as often as their projectingends are brought in contact a remarkable metallic taste isperceived. To explain this result, he supposed that somekind of vibratory movement was excited in the nerves ofthe tongue. It is the first recorded pnenomenon attributa-ble to Voltaic electricity. Describe the electrophorus ? What fact was first described in Voltaicelectricity 1 116 GALVANIC EXPERIMENTS. Fig. In the year 1790, Galvani, an Italian anatomist, observ-ed the contractions which ensue when a metallic commu-nication is made between the nerves and muscles of adead frog; he found, that if a single metal is employed asthe line of communication, contractions of the muscle takeplace whenever the metal reaches from the nerve to the muscle ; but that if two piecesof different kinds are used, thecontractions are much moreenergetic. Thus, if we takethe skinned hind legs of a frog,Fig. 100, hanging together bya piece of the spine, aroundwhich tin foil has been twist-ed, every time that we simul-taneously touch the tin foil andthe muscle with a bent copper wire, or with a copper andzinc wire, C Z, conjointly, a convulsive contraction takesplace. To explain this effect, Galvani supposed that the mus-cular system of animals is constantly in a positively elec-trical state, while the nervous system is negative. In thesame manner, therefore, that a dischaige takes place inthe case of a Leyden vi
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