The electrostatic deviation of α-rays from radio-tellurium

A determination of the electrostatic deviation of theα -rays from radio-tellurium was suggested to the writer by Professor J. J. Thomson, as a continuation of the work on α-rays done by Professor A. S. Mackenzie. The general plan of the work was to let a beam of the rays pass between two charged plates, and then fall upon a glass plate coated with a thin layer of zinc sulphide on the side receiving the radiation. A photographic plate in contact with the other side of this fluorescent screen would be affected by the scintillations and thus mark the position of the beam.