^u 



Dr. J. E. Ives on the Law of 



Table III. 



No. 



R6= 



= "5 ohm. 



E6 = l-0ohm. 



R6 = 



1-9 ohm. 















of 



Cells, 



Current 



Optimum 



- Current 



Optimum 



Current 



Optimum 



in 



Capacity in 



in 



Capacity in 



m 



Capacity in 





Amperes. 



Microfarads. 



Amperes. 



1 -65 



Microfarads. 



Amperes. 



Microfarads. 



1 ... 



•75 



•048 



•090 



•50 



•049 



2 



1-50 



•231 



1^30 



•464 



! -95 



•291 



3 ... 



2-20 



•587 



1-90 



1-359 



r40 



1^359 



4 ... 



2-90 



1^156 











5 ... 



3-60 



1-750 











Table IV. 

 Eft = •25 ohm. 



No. 

 of 



1 

 Ec=0 ohm. ' 



i 



Rc=*5 ohm. 



Ec = l-Oohm. 



.2 • 





! 



c . 











Cells. 



I4 



Optimu 

 Capacity 

 Microfart 



1.- 



P 1. 

 1 ^ S 



Optimu 

 Capacity 

 Microfara 



K 



Current 

 Ainporc 



Optimu 



Capacity 



Microfara 



K 



P" 



1 ... 



•80 



•033 



•0516 



1 ^85 



•038 



•053 



•90 -035 



•043 



2 



1-60 



•139 



•0543 



1 reo 



•204 



•080 1 



1-70 ^213 



•074 



3 ... 



2^45 



•335 



•0559 



1 2^40 



•470 



•082 



2^40 -638 



•111 



4 ... 



3-25 



•725 



•0686 



3-10 



M66 



•116 



3-20 1-578 



•154 



5 ... 



3-90 



•980 



•0644 



3-90 



^750 



•115 







6 ... 



4^60 



r359 



•0643 j! 











7 ... 



5-20 



1^720 



•0637 11 











3. The optimum capacity is a function of Bj and Rg. The 

 results are given in Tables Y. and VI. and in figs. 5 & 6. 

 They are very remarkable, and show that the optimum capa- 

 city depends not only upon the primary current, but upon 

 the resistances of the connexions leading to the break and 

 to the condenser. The same primary current was, of course,, 

 used in each experiment. The form of these curves for 

 small values of Ej and E^ was carefully examined by supple- 

 mentary experiments, and found to be that shown in the 

 figures. The curves therefore have a point of inflexion, and 

 the optimum capacity is apparently a cubic function of these 

 resistances. 



