1078 THE BELL SYSTEM TECHNICAL JOURNAL, SEPTEMBER 1953 



position and, therefore, the tab punch has not been provided with a po- 

 sitioning pilot. 



Freedom from biirrs after coding is assured by passing a sulphur-free 

 abrasive bearing rubber pad over the card several times. 



Care is required in handling the cards to avoid distortion of their 



UP STOP. 



SUPPORT BAR- 



^GLMDE BAr"^' PULL-DOWN MAGNET 



BEFORE LIFTING CARD STACK 



SUPPORT BAR 

 LIFT MAGNET 



UP STOP. 



SUPPORT BAR 





SUPPORT BAR 

 LIFT MAGNET 



DOWN, 

 STOP 



•uuuuuuMiffr^ 



uyuuuuy^ 



-CONTACT 



CARD SELECT 

 PULL-DOWN BARS RESTORED 



MAGNET 



H 



AFTER LIFTING CARD STACK 

 Fig. 28 — Mechanical lifting of cards. 



