VOLUME XXI JUNE, 1942 number i 



THE BELL SYSTEM 



TECHNICAL JOURNAL 



DEVOTED TO THE SCIENTIFIC AND ENGINEERING ASPECTS 

 OF ELECTRICAL COMMUNICATION 



The Future of Transoceanic Telephony . Oliver E. Buckley 1 



Diamond Dies for High-Speed Drawing of Copper Wire 



— H, N. Padowicz 20 



Using Double Sampling Inspection in a Manufacturing 



Plant — D. B. Keeling and L. E. Cisne 37 



Entropy — Karl K. Darrow 51 



Abstracts of Technical Articles by Bell System Authors 75 



Contributors to this Issue 79 



AMERICAN TELEPHONE AND TELEGRAPH COMPANY 



NEW YORK 



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