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.

    56/226 (page 38)
    or We see from this equation that when E is infinite, i approaches the value I e </; if we call / the limiting value of I when E is infinite, we have I=qle, and from (3) (4) al3e i2 l~ U2 E2' (5) or writing C for a I3 e/ U2 we get r . CI2 (6) as the relation between the current and the electro- motive force. The quantity a is not one that we can measure directly ; we shall try to express it in terms of quantities which can be determined ex- perimentally. Let T be the time which elapses after the rays have ceased to pass through the gas before the number of ions falls to one half its initial value, no current passing through the gas in the interval, then we have by equation (1) dn dt ' = —a?f integrating this equation, we get 1 1