[MCLENNAN- ON THE DELTA RAYS EMITTED BY ZINC 231 



found] 



The furnace current was then cut off and the rod H was raised 

 as quickly as possible until contact was made with S at C. A positive 

 potential of 80 volts was then applied to P and readings were taken 

 with increasing magnetic fields at intervals of a few minutes for half 

 an hour. 



The magnetic field was then cut off and at the end of 55 minutes 

 readings were again taken at intervals for half an hour with electric 

 fields ranging from zero to 80 volts. At the end of 90 minutes a read- 

 ing was taken with an applied field of 80 volts and a magnetic field 

 of 1,200 gauss and at the end of 190 minutes a reading was again taken 

 under the same conditions. 



All these readings are recorded in Tables V and VI and curves 

 drawn from them are shown in Figs. 6 and 7. 



VOiTAGI. on POLOMIUtt 



400 Ô00 Uoo 



MA&tltTlC FIELD 



Fig. 6. 



