Transactions of the Electrochemical Society Volume 14

Transactions of the Electrochemical Society Volume 14

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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. 1909 edition. Excerpt: ...appears first near the electrodes which are accordingly surrounded by a mantle of light. The middle or intervening stretch of gas remains dark. The "characteristic" now shows an increase in the current due to the increased ionisation. As soon as ionisation takes place along the whole intervening stretch of gas the current increases further while the potential difference of the electrodes falls--we have then the glow current. By increasing the current now, more heat is generated, and if the additional resistance is not great enough, the heating of the electrodes, especially of the cathode, through the bombardment of the electrons, is so great that with the simultaneous increase in the current and decrease in the potential the electrical discharge is carried by the vapor of the electrode. Till recently such a discharge has been designated as an electric arc. The latter is nowadays no longer considered as identical with the discharge in the form of vapor of the electrode material, but is distinguished by the low value of the fall in potential at the cathode from the glow current, as in the case of the latter this potential fall is greater. In the following investigation the discharge is a purely independent one in which the cathode fall is made relatively very small by using a hot iridium cathode covered with calcium oxide according to Wehnelt17. Vapor of the electrode material is not present in the arc. According to former nomenclature this would be designated as glow current, but is now spoken of as an arc. Prel1minary Experiments. The preliminary experiments were made with an e. m. f. of 20 to 60 volts at pressures between 0.1 and 3.0 mm., the current strength being 0.1 x 1cr3 to 0.2 x 1cr3 amp. But the quantity of nitric more

Product details

  • Paperback | 94 pages
  • 189 x 246 x 5mm | 181g
  • United States
  • English
  • black & white illustrations
  • 1236922565
  • 9781236922564