the Condenser in the Induction- Coil. 



Table I. 

 Eft and R^ small. 



4ia 



Breaking-Pole Negative. 



Breaking-Pole Positive. 



Current 



Optimum 



K 



Current 



Optimum 



K 



in 



Capacity in 



p. 



m 



Capacity in 



p- 



Amperes. 



Microfarads. 





Amperes. 



Microfarads. 





1-20 



•057 



•0396 



M5 



•033 



•0250 



1-80 



•126 



•0390 



1-70 



•062 



•0215 



215 



•182 



•0394 



2-10 



•097 



•0221 



2-60 



•2(51 



•0386 



2-60 



•126 



•0187 



3-25 



•377 



•0357 



3-60 



•283 



•0219 



4-00 



•566 



•0354 



4^65 



•383 



•0177 



4-60 



•680 



•0321 



5-40 



•480 



•0165 



2. I£ Rp or E is varied so as to vary the current_, the optimum 

 capacity varies ; in general, as a power of the current greater 

 than the square and less than the cube. This is shown in 

 Tables I. to lY., and in figs. 1 to 4 (PI. XVII.). In fig. 1 the 

 current is increased by decreasing the resistance Rp, and in 

 figs. 2 to 4 by increasing the electromotive force o£ the battery E, 

 It will be observed that the same curves are obtained in the 

 two cases. In some o£ the tables is given the ratio of the 

 optimum capacity to the square of the current. If the optimum 

 capacity varied as the square of the current this should, of 

 course, be a constant. It will be seen that when Rj and R,, are 

 very small, that is, when the resistances of the break and 

 condenser connexions are small, this is approximately true. 



Table 11. 

 R,= ]*Oohm. 



No. 

 of 



E6-^2obm. 



Ez 



= •5 ohm. 



1 

 E6 = l-9obm. 



•S ^ 



E-H^' 







s ^ 





.a 2 







CeUs. 











I'll 



K 



^ 2 



3 I>i2 



K 

 12 • 





6< 



o^g 





6< 



^og 





6^ 



^oS 





1 ... 



•45 



•008 



•0395 



•40 



•010 



•0625 



•35 



•030 



•245 



2 



•90 



•033 



•0408 



•85 



•035 



•0485 



•70 



•139 



•284 



3 ... 



1-30 



•084 



•0497 



1^25 



•095 



•0608 



1^00 



•440 



•440 



4 ... 



1^80 



•171 



•0528 



1-65 



•179 



•0656 



r35 



r20i 



•660 



5 ... 



2-30 



•318 



•0600 



2^15 



•293 



•0635 









6 ... 



2-75 



•536 



•0710 



2^55 



•557 



•0854 









7 ... 



3-25 



•870 



•0824 



300 



•946 



•1050 









8 ... 



... 



... 





3^40 



2^091 



•1800 







1 



