Electricity for public schools and colleges . ctual conditionof the organ, partly upon the general health and vigour of theanimal, and partly upon its volition. The study of the relation of these electrical phenomena towhat we may call vital phenomena is exceedingly interesting ;but we do not intend to include in the present Course anythingthat belongs of right to the domain of physiology. § 5. Voltas Cell, and the Couronne des Tasses, from Voltaspoint of view.—In order to obviate the running down of thepower of his pile, resulting from the alteration of the surfaces ofthe metals, Volta substi
Electricity for public schools and colleges . ctual conditionof the organ, partly upon the general health and vigour of theanimal, and partly upon its volition. The study of the relation of these electrical phenomena towhat we may call vital phenomena is exceedingly interesting ;but we do not intend to include in the present Course anythingthat belongs of right to the domain of physiology. § 5. Voltas Cell, and the Couronne des Tasses, from Voltaspoint of view.—In order to obviate the running down of thepower of his pile, resulting from the alteration of the surfaces ofthe metals, Volta substituted dilute acid for wet paper. His pile then took the form of a number of cells or elementsjoined end-on, forming what was called the Couroiine des here give a sketch in section of this arrangement. The zincs and coppers are plates connected by copper wires;they are immersed in vessels of dilute sulphuric acid. In thefigure we have supposed the copper wire that is soldered to thezinc plate to be to earth and so at zero-V. ^Cv^. The rise of V through the arrangement is indicated. Thereader will see that, according to this vieiv, the A V of a single ele-ment is practically the same as that due to the first copper \ zincjunction. When the terminals are connected a cun-ent flows, andenergy is given out in the circuit. When pure water is used in the vessels we find the A V betweenthe terminals to be approximately the same as if dilute acid had beenused. But if we complete the circuit for a few moments, and againbreak it, we find that this A V has almost or quite disappeared. The lyo ELECTRICITY ch. xi. battery has run down, as did the pile. Examination will then showthat the surface of the zinc has been oxidised, while the copper iscovered with a film of hydrogen. From Voltci s point of view we should say that we now have a newseries of bodies in contact ; viz. copper \ zinc \ zincic oxide \ ivater \Iiydrogefi \ copper. The cell is now very different from its original
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Keywords: ., bookcentury1800, bookdecade1890, bookpubl, booksubjectelectricity
