»8 



ROYAL SOCIETY OF CANADA 



and in this way the time was ascertained when the deflections became 

 stationary. When these stationary states had been reached the exhaus- 

 tions were then made and when the limiting pressures given above were 

 reached, readings on the charging effect were commenced. These, it will 



TABLE VIII. 



Hours. 



Time. 



M in. 



Deflection in mm. on Scale. 







30 



00 



30 



00 



30 



00 



30 



00 



30 



00 



30 



00 



30 



00 



30 



00 



30 



00 



30 







2 



3 



3 



5 



6 



8 



8 



9.5 

 11.5 

 13.0 

 14.0 

 15.0 

 16.0 

 17.0 

 19.0 

 20.0 

 22.0 

 24.0 

 26.0 



be seen, confirm the results obtained with the potassium chloride in the 

 earlier experiments. 



These results show that in high vacua both potassium nitrate and 

 potassium sulphate emit an eicess of charged particles of the beta type. 



