12 



BELL SYSTEM TECHNICAL JOURNAL 



WAVEMETER SCALE 



GAS INLET 



END SEAL 



DUPLEXING 

 ADJUSTMENT 



WAVEMETER 

 CONTROL 



PHASE CONTROL 



SWEEP D6 



JACK J! 



SWITCH Dl 



MONITORING 

 RECTIFIER 



GAS PRESSURE 

 REGULATOR 



DUPLEXING 

 ADJUSTMENT 



NDIVIDUAL 

 TERMINAL STRIP 



MAIN TERMINAL 

 STRIP 



GAS CYLINDER 



Fig. 9-CXAS-Main unit 



transmitted pulse and to effectively disconnect the transmitter when the 

 echo is received. If this were not done, a large part of the transmitted 



