﻿Balance Method af measuring X-Rays. 



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occurs in C oscillations are easily observed, vide fig. 4. The 

 oscillations under our experimental conditions were not due 

 to fluctuations in the radiating power of the radium, for, it' 

 the ionization in C is produced by a radium source giving 

 beta and gamma rays, a very steady balance is obtained. 

 The oscillations which may be produced when an alpha ray 



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source is used has been studied by Geiger (Phil. Mag. vol. xv. 

 p. 539, 1908), who showed that they were due to actual 

 variation with time in the number of alpha particles emitted. 

 He showed that for similar ionization by beta radiation, 

 oscillations still occurred, though their significance was 

 minimized owing to the greater numbers involved. It might 

 be possible to detect oscillations in the X-ray case, con- 

 sidering their origin in the cathode stream, but under the 

 usual experimental conditions it seems certain that the lack 



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