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BELL SYSTEM TECHNICAL JOURNAL 



zero for all instants before and after the disturbance in question, and 

 equal to the instantaneous value of the wave thruout its duration. 

 In Fig. 1, curve A represents a telegraph dot, curve B gives the rela- 



TELEGRAPH DOT. 



AMPLITUDE-FREQUENCY CHARACTERISTIC 

 OF TELEGRAPH DOT 



FREQUENCY 



DOT FREQUENCY 



(B) 



FREQUENCY 



PHASE- FREQUENCY CHARACTERISTIC 

 OF TELEGRAPH DOT 



Fig. 1 



tive amplitudes, S, of its components plotted against their frequencies, 

 and curve C, their phase, 6, also as a function of frequency. The 

 so-called "dot frequency" corresponding to a sustained succession of 

 such dots is indicated on curve B. 



