MEASUREMENT OF TELEGRAPH TRANSMISSION 167 



jj^fft 



Fig. 16 — Test-sentence transmitter-distributor. 



TO JACKS AT TELEGRAPH BOARD 



RELAY 

 NO 1 



DISTRIBUTOR 



ADDITIONAL 

 RELAY 

 UNITS 



•' VvVi 



± 



Fig. 17 — Schematic circuit of automatic multiple sender. 



