ABSTRACT
The interesting results recorded by Mr Eve in the preceding letter on the relative conductivity of gases for very penetrating Rontgen rays removes the strongest objection that has been urged against the common belief that the rays are an extremely penetrating type of Rontgen rays. All the experimental evidence so far obtained is now in agreement with the view that the rays are very penetrating Rontgen rays which have their source in the atom of the radio-active substance at the moment of the expulsion of the or cathodic particle. On the theory of the nature of Rontgen rays, developed by the late Sir George Stokes and Prof. J. J. Thomson, it is to be expected that Rontgen rays would be set up at the sudden starting as well as at the sudden stopping of the electron or particle. As a result of the sudden expulsion of the particle from radium, it is to be expected that a narrow electromagnetic pulse.
