ABSTRACT
This chapter includes early papers written in New Zealand, at the Cavendish Laboratory and during the Montreal period (1894-1906), as well as an introduction to Lord Rutherford's early work by Sir Edward Appleton, and some reminiscences of his time in Canada by Professors H. L. Bronson and Otto Hahn. The source of rays consisted of a fine wire, which had been made active by exposure as the negative electrode in a vessel containing a large quantity of radium emanation. Fifteen minutes after removal from the emanation, the radiation comes only from the product radium C. The photographic effect of the rays after passing through 14 layers of foil was not more than 5 per cent. We have seen that it is possible to determine with accuracy the value of the particles emitted by radium, radium A, and radium F by measurements of the retardation of the particles of the single product radium C in passing through matter.
