VOLUME XX APRIL, 1941 number 2 



THE BELL SYSTEM 



TECHNICAL JOURNAL 



DEVOTED TO THE SCIENTIFIC AND ENGINEERING ASPECTS 

 OF ELECTRICAL COMMUNICATION 



Steady State Solutions of Transmission Line Equations 



— S. O. Rice 131 



Engineering Problems in Dimensions and Tolerances 



—W. W. Werring 179 



Time Division Multiplex Systems — W. R. Bennett . . . 199 



Steady State Delay as Related to Aperiodic Signals 



—R. V. L. Hartley 222 



Engineering Requirements for Program Transmission Cir- 

 cuits — F. A. Cowan, R. G. McCurdy and I. E. Lattimer 235 



Abstracts of Technical Articles by Bell System Authors . 250 



Contributors to this Issue 253 



AMERICAN TELEPHONE AND TELEGRAPH COMPANY 



NEW YORK 



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