380 THE BELL SYSTEM TECHNICAL JOURNAL, MARCH 1954 



CARD 2 RUN 3 100 CARDS IN BIN 



.^_— LIGHT OUTPUT OF LEFT APERTURE 



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•LIGHT OUTPUT OF RIGHT APERTURE 



CARD 1 RUN 5 15 CARDS IN BIN 



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littllltlMMIlliniHIHHiii. 



— H 10 MS (< 

 CARD 4 RUN 5 85 CARDS IN BIN 



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CARD 9 RUN 1 15 CARDS IN BIN 



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lillllllHItllllliilllliilHlMnt. 



CARD 5 RUN 5 50 CARDS IN BIN 



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Fig. 1 — Card motion shadowgraphs, card support bars working 



