In this paper an account will be given of experiments which have been made to determine the amount of energy which reappears as Röntgen radiation when homogeneous cathode rays of given speed fall upon anticathodes of different materials. The method of attack is modified from that used in a previous research on “The Direct Production of Röntgen Radiations by Cathode Particles.” Fig. 1 is taken from that paper, and shows how cathode rays of given speed, which have been isolated by means of magnetic deflection, strike an anticathode situated in the tube A. The Röntgen rays so produced pass into an ionisation vessel B, and the ionisation due to them is measured by an electroscope C.
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R. Beatty (1913) studied this question.