FUNDAMENTAL PROBLEMS. 



79 



velocity /of the center of the lever, although (half) the sum of 

 the velocities of the ends of the lever is at each instant equal to 



Fig. 70. 



the velocity of the center of the lever, just as the sum of the cur- 

 rents in L and C Fig. 68 is at each instant equal to the cur- 

 rent delivered by the alternator. 



37. The influence of inductive reaction and of capacity reaction 

 upon the shape of the current curve (non-harmonic electromotive 



Fig. 71. 



force). As has been stated in Art. 7, the alternating current 

 which is produced by any alternating electromotive force in a cir- 



