The discharge of electricity through gases : lectures delivered on the occasion of the sesquicentennial of Princeton University / by J.J. Thomson ; with diagrams.

  • Thomson, J. J. (Joseph John), 1856-1940.
Date:
1898
Catalogue details

Licence: Public Domain Mark

Credit: The discharge of electricity through gases : lectures delivered on the occasion of the sesquicentennial of Princeton University / by J.J. Thomson ; with diagrams. Source: Wellcome Collection.

Provider: This material has been provided by the Francis A. Countway Library of Medicine, through the Medical Heritage Library. The original may be consulted at the Francis A. Countway Library of Medicine, Harvard Medical School.

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    air, though the saturation current through air is much greater than that through hydrogen. This is shown in the following diagram, which repre- sents the / and E curves for hydrogen and air. The curves intersect, the hydrogen curves being above the air curve for small values of the electro- motive force and below it for large values. The saturation current depends merely on the number E. M. F. Fig. 5. of conducting particles produced by the rays while the current in the early part of the curve depends upon the space described by the conducting parti- cles in the time T (see equation 10) ; and we infer from these curves that more ions are produced by the rays in air than in hydrogen, but that the product of U, the velocity of the ions, and T, a 4