Alpha Particles from Polonium. 



253 



Fig. 3. 



Fig. 3. The full line curves I, II, and III are the theoretical ionization 

 curves for nitrogen, sulphur dioxide, and ether, respectively, as obtained by 

 substituting the corresponding values of c given in column 2, Table I, in 

 the equation 



1 = 



where r = 10 - 8. 



(r—x) y$ 



The dotted curves I, II, and III are the experimental ionization curves for 

 nitrogen, sulphur dioxide, and ether, respectively, and are plotted similarly 

 to the curves in figures 1 and 2. 



The full line curves, I, II, and III in figure 3 represent the 

 theoretical curves for nitrogen, sulphur dioxide, and ether, 

 respectively, as obtained by using the values of o as recorded 

 in column 2, Table I, for the respective gases. The dotted 

 curves are the corresponding experimental curves and, as can 

 be seen, agree very well with the theoretical curves. The 

 agreement between the theoretical and the experimental 

 curves for the other gases was equally as good as it was for 

 those given in figure 3. In some cases the agreement was 

 much closer. This agreement between theoretical and experi- 

 mental curves confirms the assumption that the energy 

 assumed is proportional to the ionization produced. 



The ionization at any point of the path of the particle being 

 given by the relation 



1= 



(r-x)Vi ' 



