356 Mr Noda, Ionization of gases exposed simultaneously to 



On the ionization of gases exposed simultaneously to Rontgen 

 rays and the radiation from radio-active substances. By T. Noda, 

 Tokio Higher Normal School, Japan. Communicated by Prof. 

 J. J. Thomson. 



[Read 14 May 1906.] 



| 1. The following experiments were undertaken to see 

 whether the ionization due to X-rays and different Becquerel 

 raj^s acting simultaneously is equal to the sum of the ionizations 

 due to the same rays acting separately. 



A 



w 



l\ 



:C 



The apparatus consists of an ionization vessel V and a small 

 gold-leaf electrometer E, with the connecting wire W between 

 them. 



