The Voltaic Cell; Its Construction and Its Capacity

The Voltaic Cell; Its Construction and Its Capacity

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1893 edition. Excerpt: ...receptacle and as the positive electrode. (The alkaline nitrates melt at about 200 C., but do not decompose until at from 1000 to 1200 C. Up to this point not only do they not attack metal vessels which contain them, but they appear, on the contrary, to have the singular property of preventing oxidation by fire, or at least of retarding the same considerably.) The coke is held by an iron wire which also serves as a terminal. With the nitrate in a fused state a current of E. M. F. from I to 2 volts is produced. If instead of nitrate in fusion an aqueous solution of the salt be employed, the poles are reversed. In fact, in an iron-carbon couple using a solution of soda or potash nitrate the iron is positive and acts like the zinc in the ordinary cell. Brard " Brick " (1882).--This is an agglomerate of ordinary carbon on which is placed a tablet composed of a mixture of nitrate of potash and cinders and separated by an interposed sheet of asbestos paper. The poles are metallic rods which traverse the carbon and nitrate and protrude from one end of the " brick." If the end of the brick opposite to the terminals be placed in the fire, the carbon becomes red hot, the nitrate melts and the current is established, weak at first but gradually stronger, until finally a maximum is reached which remains constant as long as the intensity of combustion is kept uniform. A small brick 15 cm. long, 3 cm. wide and thick, weighing 22O grams, of which 120 grams is nitrate of potash and 65 grams cinders, burns for nearly two hours giving daring the whole period a current of from 0.9 to 1.2 volts through a resistance of from 1.2 to 0.8 ohm. The resistance of this element, cold, is 104.5 ohms. Crum Heat Cell.--Carbon; iron, black iron more

Product details

  • Paperback
  • 189 x 246 x 8mm | 268g
  • United States
  • English
  • black & white illustrations
  • 1236961560
  • 9781236961563
  • 2,295,356