Velocity of Electrons expelled by X-rays. 747 



was directed through the window and ionization vessel on to 

 the screen from which the corpuscular radiation was to be 

 A series of observations o£ the ionization produced 

 Fig. l. 



studied. 



?/ectroscope 



Fisr. 2 



Pressure 



in the'chamber at various pressures of the contained air was 

 taken, and plotting ionization and pressure of air, a curve of 

 the usual form (fig. 2) was obtained. 



3C2 



