CARD TRANSLATOR FOR NATIONWIDE DIALING 



1073 



MOUNT FOR STEADY REST 



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PARTiTiONS 



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^ CARD PiN BAR 





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VOJNr iK-G 



GUIDE BAR 



Fig. 25 — Card cage. 



not progressed far enough to affect the surface sensibly. It will be ob- 

 served that when the temperature is too high the grain growth is more 

 pronounced and that as a result substantial protuberances appear on 

 the chromium surface. Cards possessing such protuberances exhibited 

 a marked increase in interface friction. 



Distribution of the cards in the translator posed some important prob- 

 lems. Sufficient space had to be provided to accommodate a full com- 

 plement of cards. Yet it was realized that there would be cases where 

 the translator would not be fully equipped and under these conditions 

 the cards, due to the surplus space available, might lean sufficiently to 

 render them inoperable. To obviate such a possibility a partitioned cage 

 — see Fig. 25 — is provided for the cards. The partitions are close 

 enough to one another to assure that if but a single card is used in a 

 compartment it will operate satisfactorily. This is illustrated by Fig. 26. 

 The spacing thus arrived at is a little less than 1". This spacing provides 

 sufficient room for reliably handling 98 coded cards and a blank card 

 adjacent each partition making a total of 100 cards to a compartment. 

 The blank cards improve the performance of the adjacent cards. 



Twelve compartments were decided upon after due consideration 

 of the many related problems such as Ught tunnel transmission losses, 



