202 Heating Effects- at the Anode in Vacuum- Tubes. 



small. The results of Tables VII. and VIII. are shown 

 graphically in fig. 5. Fig. 5. 





ho 





\ 70 c*n 





(3o 







X * 







X 







f 



CHTHODB 



x 











* 



J 

 I 

























A /VOJD£ 







y* 













•k. 

















\s 





l"* 





.* 



,JO 



In both curves with short distances, a disturbance is intro- 

 duced due to the nearness of the electrodes. Neglecting 

 these distortions, it is clear that the energy given up to the 

 cathode is independent of the length of the distance between 

 the electrodes. This agrees with the assumption made before 

 that the bulk of the positive ions originate in the negative 

 glow. Were any produced in the space nearer the anode, 

 the energy given up would increase with the distance between 

 the electrodes. 



In the case of the anode an increase in the distance between 

 the electrodes is accompanied by an increase in energy. 

 Though the curves obtained showed a tendency to reach a 

 maximum, none was reached even with a length of discharge 

 of 24 cm. This seems to indicate that the transference of 

 momentum by collision plays a large part in the " accumula- 

 tion " of energy, for one would expect an equilibrium stage 

 in clustering to be reached long before all the collisions in a 

 20 cm. path have occurred. 



Summary. 



1. Results showing the relation between current, gas 

 pressure, and energy, given to the anode in oxygen have 

 been obtained. 



2. The relation between the energy communicated to 

 either electrode and their distance has been investigated. 



3. The mechanism of discharge has been discussed in the 

 light of these results. 



Physics Department. 

 The University, Bristol. 



