THE souxns or srnncn 



595 



In coinl)initisj thi" transmit tor, tin- ainplifuT and the osrilloKraiili to 

 form till' (•oin()li"tc rirortlitig .ipparatus thi-ro were two primary ri'fiuire- 

 nu'iits; first, tlu- set as a whole should bo free from frreiiu'tiiy distortion 



Fii;. 3 — Curve .'1; Atnplitucic frequency characteristic of amplifier. Curve B: 

 Phase lead of output, vs. frefiuency of voltage iii[)ut to amplifier 



toot) 3000 _}OiJO 4000 



Frrtfuency 



Fig. 4 — Curve .l; .Amplitude frequency characteristic of oscillograph. Curve B: 

 Phase lag of amplitude behind current in oscillograph 



in both amplitude and phase, and second, the output of the set as 

 a whole should be a linear function of the input within the working 

 energ>- range at each frequency. The first of these conditions is in 



