598 



THE BELL SYSTEM TECHNICAL JOURNAL, JULY 1951 



Changeable Translators 



The Western Electric Company's first full-automatic panel office made 

 use of a rotary- type switch in order to obtain within the senders a trans- 



<NOT ALL USED 



^^STOP POINTS 

 '44 



INPUT 

 CODE 



TO OTHER y , 



CONTACT ARCS^ ** ® / 



OUTPUT 

 CODES 



Fig. 4 — Changeable office-code Iranslalor used in first full-automatic panel office. 



lation from the 2-digit office codes to the switching control codes necessary 

 to make the selections to reach the office containing the called number. 

 The fundamental arrangement of this translator is shown in Fig. 4. 



In this case the setting of the registers for the first two dialed digits 

 causes a mark to be placed on a terminal in a one-out-of -one hundred 



