Proceedings of the Electrical Society of Cornell University Volume 2

Proceedings of the Electrical Society of Cornell University Volume 2

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1895 edition. Excerpt: ...agreement with the results of experiment. The voltaic cell is looked upon as "a machine run by osmotic pressure." In the case of the gravity cell, for example, the action may be looked upon as resulting from the fact that the solution tension of Zn is greater than that of Cu. The Zn therefore continually goes into solution, replacing the Cu which is deposited. Positive electricity is carried away from the Zn electrode by the Zn ions, and given up to Cu pole by the Cu ions, thus setting up a current. Unless the circuit is closed, this current is only temporary, for + and--charges developed upon the Cu and Zn poles respectively, lead to polarization, and soon neutralize the tendency for further solution by their electrostatic forces. A knowledge of the solution tensions of the metals, and of the nature and concentration of the solutions used, makes possible the computation of the E. M.F. of a cell. The computed and observed results are, so far as they have been tested, in excellent agreement. The theory also allows a prediction of the variation of E.M.F. with the temperature, thus affording a still further check. It is needless to call attention to the fact that such predetermination of the probable behavior of a cell may lead to a considerable saving of trouble and expense to those engaged in experimentation along these lines. Certain general principles, applicable to all cases, may be derived without the necessity of considering special cases. For example, since the action of a cell depends upon the employment of metals having different solution tensions, the results will be best, other things being equal, when the solution tensions differ as widely as possible. This would lead to the employment of a metal of high tension, such as zinc, more

Product details

  • Paperback | 44 pages
  • 189 x 246 x 2mm | 95g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236537513
  • 9781236537515