Radiation produced by slowly moving Cathode Rays. 3(3 



Pressure in Discharge-tube Size of Dark Space 4 mm 

 *6 mm. of mercury. 



Distance of 



window from 



surface of 



cathode in 



millimetres. 



4 

 5 



10 



20 

 30 

 40 



Potential- 

 difference 

 between anode 

 and cathode 

 in volts. 



1600 

 1600 

 1600 

 1500 

 1500 

 1400 

 1500 



Current through 



tube in 



milliamperes. 



Rate of leak, 



scale-divisions 



per minute. 



8-1 

 93 

 93 

 92 



88 

 89 



88 



3 



20 

 30 



28 



14 



8 



3 



Pressure in Discharge-tube 

 *4 mm. of mercury. 



Dark Space 6 mm. 



3 



1700 



62 



21 



4 



1700 



62 



54 



5 



1700 



7-0 



105 



6 



1700 



6-6 



195 



8 



1700 



66 



150 



10 



1700 



G-(J 



180 



20 



1700 



7-0 



66 



30 



1700 



7 



40 



40 



1700 



64 



25 



Fi<r. 4. 



























1 



r x 







( > 









DAf?/f SP"/IC£ 



