Mr. J. J. E. Durack on Lennrd Rays. 



35 



Current, 

 amps. 1*2 . 10~ 9 . 



Distance, 

 mm. 



Current. 



Distance. 



11-75 



2 



0-75 



8 



5-50 



3 



0-63 



9 



3-50 



4 



0-50 



10 



2-10 



5 



0-50 



11 



Mo 



6 



0-35 



12 



1-00 



7 



0-30 



12-5 



These numbers are shown by the circles O in curve I. ; the 

 curve is drawn from the formula 



(Current) (Distance ) 2 = const., 

 the constant being found by assuming the point distant 8 mm. 

 from the window to lie on the curve ; it will be seen that the 

 circles lie nearly on the calculated curve : the crosses X give 

 the calculated values. 



§ 3. Experiments were next undertaken to find the current 

 carried by the Lenard rays themselves, and at the same time 

 the ionizing power of the rays. 



Fisr. 3. 



Tb EilCTKOMrrfa 



The apparatus is shown in fig. 3 ; the old discharge-tube 

 having been pierced by the discharge, a new one was made 



P2 



