Capacity for Induction-coils and Tesla Coils. 



231 



which makes u equal to 0*429, a minimum occurs when 

 w = 0*l, and a secondary maximum when u is about 0*06. 

 At this last value o£ u, however, the primary capacity is 

 only 0*025 mfd., and good interruptions are rare if the 

 primary current is as great as 1 ampere. 



For certain values of P there are two equal greatest 

 maxima of U sin (/>, one corresponding to a value of u 

 greater than, the other less than, 1 — P. This happens, for 

 example, when k 2 is about 0*71, the two equally effective 

 values of n<Jn\ being in this ca-e 3*707 and (5*595. It also 

 happens when k 2 has the approximate values 0*87 and 092 

 (see Table I.). From the point o£ view of efficiency these 

 adjustments are not so advantageous as those in which the 

 maxima of U and sin (f> occur together. 



The values of u which give the greatest maxima ot U sin <f> 

 have been calculated in the same way For other values of k 2 

 ranging from 0*92 to 0*5. The results of these calculations 

 are given in Table I., in which the first column contains the 



Table I. 

 Adjustments for maximum secondary potential. 



/r. 



■rw 



00628 



"■-■. 

 15 



' 



L 8111 0. 



Efficiency. 

 i. 1 Bin 2 <p. 



092 







1-042 



1-042 



0-999 



n 



() L297 



11 



1 040 



1040 



0-995 



090 



00965 



11 



1 n.,1 



1054 



LO 



0-87 



0075 



107'.) 



L-067 



L-067 



0-990 





021 



7-183 



llttiii 



L-066 



0989 



0-835 



0-165 



7() 



L094 



1094 



10 



0-7«8 



Oil 



6-801 



1125 



1 ■ 1 2 1 



0-970 



071 



009 



6-595 



II 12 



1-138 



919 



„ 



oil 



3-767 



1 174 



1 137 



0918 



070 



oil:. 



3 68 



lis:; 



I 163 



o <.»:,() 



0-64 



0-45 



3-299 



1-246 



L-238 



0-981 



0*60 



0-435 



312 



1-LllO 



L-288 



OH'. Hi 



0-671 



0-429 



3-0 



L-323 



1 323 



l-o 



0f> 



041 



2-752 



1-408 



1-401 



0-983 



values of /.'-', the second column tie' values of // required for 

 the greatest maxima of D sin <£, the third column the cor- 

 responding values of the frequency-ratio » 2 /»i- The fourth 

 and fifth columns contain the values of U nnd II sin </), 

 Corresponding to these values of k* and u, and the last 

 column gives the product k 2 V 2 sin 2 </>, which is equal to the 

 efficiency of the arrangement, i. e. the ratio of the greatest 

 maximum electrostatic energy in the secondary circuit, 



iCoV~ wi T - 12 , to the initial energy-supply iWo 2 - 



