Page:CunninghamPrinciple.djvu/1

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LI. On The Elctromagnetic Mass of a Moving Electron.
By E. Cunnigham, St Johns's College, Cambridge.*[1]


IN his discussion of the electromagnetic mass of a moving electron (Theorie der Elektrizität, ii. p. 205), Abraham raises an objection to the Lorentz conception of an electron as having, at rest, a spherical shape, but in motion the shape of an oblate spheroid the ratio of whose axes is , v being the velocity relative to the tether, and c the velocity

  1. * Communicated by the Author.