﻿Effective Adjustment of an Induction-coil. \ 9 



to give the best effect. I£ L x and Q x were reduced, by 

 amounts which would cause no appreciable change in the 

 spark-length, the differences would disappear. 



From the above data the secondary potential can now be 

 calculated*, and the result, expressed in volts for « ==10 

 amperes, is 



V 2 = 60l300.6r 2e6 'sin (14900.0*- 1-95)° 

 -206900 . e- 1U0t sin (435000*- 5-7)°. 



From this expression values o£ V 2 , the difference of 

 potential at the secondary terminals t seconds after the 

 interruption of the primary current, were calculated for 



Fig. 3. 



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t. I0 3 sec. 



Secondary potential. 



various values of t up to '003 second, a time covering rather 

 more than one whole period of the longer wave. The results 

 are exhibited in fig. 3, in which (A) shows the two oscillations 



* The general expression for V 2 is given in the previous paper, /. c. 

 pp. 565, 674. The statement in the footnote on p. 574 requires correction. 

 \Vhen the condenser is connected directly across the interrupter, so that 

 the battery (e.m.f. E) is included in the primary oscillating circuit, we 

 have initially V 1 =0, but finally V T = — E, The results as given on 

 pp. 574, 575, apply to this case provided Vj is taken as E+lhc petential- 

 difterence of the primary condenser. 



