AUTOMATIC TESTING OF RELAY SWITCHING CIRCUITS 1167 



Fig. 8 — Tape-0-Matic test set in operation". 



strip and cabled to a gang plug which in turn is plugged into a receptacle 

 behind the operator. These leads are extended through a duct to the 

 metal enclosure at the base of the set for entry to the test set proper. 

 The coded tape is dropped into the receptacle at the side of the key 

 shelf to which it returns after its traverse through the reader. A row of 

 circuit breakers on the end of the key shelf control the application of 



