EFFECT OF MOMENTUM in 



These oscillographic records show many things 

 of great interest . Firstly, that if the metallic space 

 between each of several consecutive glue lines in a 

 half-tone print be s, greater than that si between 

 each line in another print, the current passing 

 through the strings A, B is greater in the case of 

 the s lines than in that of the Si, although the line 

 resistance, battery power, etc., be the same in both 

 cases ; hence a definite time is required for the 

 current transmitted to reach a maximum value, the 

 possible value not being so nearly reached when 

 the interruptions are very rapid as when slower, and 

 the maximum value being very rarely reached. 

 Secondly, that where a large number of consecutive 

 currents of equal period p are transmitted, the dis- 

 placement of the galvanometer strings increases 

 gradually to a maximum value, then decreases, and 

 so on, instead of remaining always equal and pro- 

 portional to p. Thirdly, -that when the period p 

 has a certain value, equa.] to the natural period of 

 swing of the strings, the displacement is excessive, 

 and very much higher than that obtainable under 

 any other circumstances, R and C remaining equal. 



The effect of a pumber of currents of equal period 

 to cause a gradual extension of the swings which 

 reach a maximum and then decrease, indicates that 

 a dead-beat action like the electrolytic one is pre- 

 ferable to any form of moving part, where there 

 is definite momentum, and kinetic energy. 



