1056 THE BELL SYSTEM TECHNICAL JOURNAL, SEPTEMBER, 1953 



With the latch restored to normal the pull-up magnet is de-energized. 

 All the cards then drop until they meet the code bars, about 0.016". 

 The card for the particular code, however, continues 0.180" further, 

 because the bars for all the tabs have been lowered until it rests on the 

 pull-down magnetic pole face. The index channel relays then operate 

 causing the decoder to read the output of the card. 



When the decoder has checked that it has received proper information 

 from the card, and on certain calls when the marker has selected an 



WARM AIR OUTLET 



i 



AIR INLET FILTER 





r-VENTILATiNG 

 LOUVERS 



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Hum Mfi'tif 



HOtifu ««»*%'■ 



mm feffi: 



mmit '"'""" 

 mini'' 



Fig. 13 — Card translator equipped with cooling unit. 



