718 Prof. E. Taylor Jones and Mr. D. E. Roberts on 



the primary circuit, the second the maximum potential calcu- 

 lated by (1), the third the maximum potential deduced by 

 measurement of the plates. 



30 







Fig. 6. 



















i/OLTS 54 



ooo- 







A 









5c 



.ooo- 



15 





\ 









j 













A 





20 











\i\ 





'^m 





\r 











1, 





j ' 









4(1000- 



j 















^ 



r J 









1 



3! 



.ooo- 



10 























J 





V 3C 



,000- 



5 









/ 





\ 2!i,000- 



1 

 I 







J 





\ 20,000- 





J 







1 





\3 



ooo- 





j 



< 



T. /N THC 



5 



USflNO TH 



S CF /7 S£ 



5 6 

 C0/VZ?. 



»! = 174-4, w«=1371, 



:2*25 amp. 



Table I. 



amperes. 



Maximum Potential in volts. 



Calc. 



Obs. 





2-64 



61910 



72220 



3-16 



74110 



84110 





3-90 



91460 



101070 





4-44 



104120 



118560 





5-10 



119600 



132940 





The greatest spark-length observed between the two spheres 

 with the current of 5*1 amperes, was 7 "3 centimetres. 



The observed value of the secondary potential is in this case 

 greater than the calculated value. Probably the calculated 

 value is too small, owing to the fact that the expression (1) 

 does not correctly represent the phase relation of the two 

 oscillations, as we see by comparing the photograph PL XIII. 

 fig. 13, with the calculated curve fig. 6. 



