362 



Mr Noda, Ionization of gases, etc. 



window wide enough to let X-rays from a tube by the side of the 

 vessel pass through every part of the vessel. 



The procedure of the experiment is the same as in the last 

 experiment. It is only to be remarked that since the discharge 

 was greater than in the previous cases, owing to a larger surface 

 of the wire net and of the uranium oxide used, I let the discharge 

 go on through 25 divisions (from 65 to 40) of the micrometer 

 scale. 



The condition of saturation of the current was tested and 

 found complete. 



The following are the results. 



Experiment 7. 



Time in sec. 



required by 



uranium-rays 



Time in sec. 



required by 



X-rays 



Time in sec. 



required by 

 uranium-rays 



and X-rays 



Leakage due 



to 

 uranium-rays 



3 CO 



ha g* 



CD 'r* 



CD ' 



CO ■*= 



Sum 



Leakage due to 



uranium-rays 



and X-rays 



o 



"cl 



PS 



139-5 



159-3 



73-1 



0-00717 



0-00628 



0-0135 



0-0137 



1-01 



135-2 



159-5 



73-4 



740 



627 



137 



136 



0-99 



136-7 



162-7 



73-8 



732 



615 



135 



136 



1-01 



133-5 



176-8 



74-7 



749 



566 



132 



134 



1-02 



135-2 



131-6 



67-3 



740 



760 



150 



149 



0-99 



140-9 



131-0 



66-4 



710 



763 



147 



151 



1-03 



141-3 



126-5 



69-0 



708 



791 



150 



145 



0-97 



142-5 



122-9 



67-5 



702 



814 



152 



148 



0-98 



1330 



144-5 



70-0 



752 



692 



144 



143 



0-99 



138-2 



134-0 



69-7 



724 



746 



147 



144 



Mean| 

 valuej 



0-98 



100 



From this table we see that the ionization due to uranium- 

 rays and X-rays acting simultaneously is equal to the sum of 

 the ionizations due to their acting separately. 



Thus X-rays and all Becquerel rays have the same ionizing 

 power whether they act separately or simultaneously. 



In conclusion I have much pleasure in acknowledging the 

 invaluable advice and kindly interest of Prof. Thomson. 



