224 



THE ROYAL SOCIETY OF CANADA 



P and, finally, when a potential of 40 volts was reached, none es- 

 caped from P at all and the current became constant and consisted 

 of the first four constituents mentioned above. This result was exactly 

 in accordance with what Logeman had previously observed and it 

 showed that the apparatus was working satisfactorily. 



Experiment II. In the second experiment the polonium-coated disc, 

 P, was kept joined to the positive terminal of the battery at a steady 

 potential of 80 volts. This ensured that no electrons escaped from P. 



The electromagnet was then excited with currents of different 

 intensities and readings were taken on the corresponding currents 

 through the chamber to the zinc plate X. The results in one of the 

 experiments of this type are given in Table II and are represented 

 graphically in Fig. 3. 



laoo I400 



riACTlETlC FIELD C<;.AU55> 



Fig. 3. 



