. Elements of chemistry ... ors of the electric fluid ;one of them a simple conductor, the other two having eachthe additional power of different degrees of electrical, orgalvanic excitement. These three substances are usually zinc, water, andcopper, and these, arranged in the order named, compose asimple galvanic circle. The water, which is mixed with a small quantity ofacid, not only serves as a conductor of the galvanic fluid,from the positive to the negative metal, but also by actingslightly on the metals, is the efficient cause of the galvanicexcitation. 136. This arrangement, together wi
. Elements of chemistry ... ors of the electric fluid ;one of them a simple conductor, the other two having eachthe additional power of different degrees of electrical, orgalvanic excitement. These three substances are usually zinc, water, andcopper, and these, arranged in the order named, compose asimple galvanic circle. The water, which is mixed with a small quantity ofacid, not only serves as a conductor of the galvanic fluid,from the positive to the negative metal, but also by actingslightly on the metals, is the efficient cause of the galvanicexcitation. 136. This arrangement, together with thecourse of the electrical agent from one metalto the other, and through the water to thefirst metal again, will be understood by Suppose c to be a plate of copper, and z aplate of zinc, touching each other at the placed in a vessel of acidulated the action of the acid will produce anevolution of electricity from both metals, that What is the principle on which the Voltaic pile is constructed7. galvanism. 05 from the zinc being positive, and that from the copper ne-gative. The electrical fluid will therefore pass from ttiezinc, through the water, to the copper, and from the copper,bj contact, to the zinc, and so in a perpetual circuit, in thedirection of the arrows. 137. Compound galvanic circle.—It is a multiplication ofthis principle; that is, by forming a series of simple galvaniccircles, which composes the galvanic pile, or pile of Volta,already mentioned. This compound galvanic circle is constituted by a seriesof simple circles, so united as to concentrate the influenceof the whole at a given point. It may be constructed asfollows: Provide three glass rods, say of two feet in length each,and fix these in an angular direction from each other in abase of wood. Provide, also, circular plates of copper-andzinc, two or three inches in diameter, about the eighth ortenth of an inch thick, and in number proportionate to thepower of the intended pil
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