iv BELL SYSTEM TECHNICAL JOURNAL 



JULY, 1948 



A Mathematical Theory of Communication — C. E. Shannon 379 



An Aspect of the Dialing Behavior of Subscribers and Its Effect on the 



Trunk VlsLUt— Charles Clos 424 



Spectra of Quantized Signals — W. R. Bennett 446 



Analysis and Performance of Waveguide-Hybrid Rings for Micro- 

 waves — H. T. Budenhom 473 



Methods of Electromagnetic Field Anatysis— 5. A. Schelkunoff 487 



The Evolution of the Quartz Crystal Clock — Warren A. Harrison 510 



OCTOBER 1948 



Equivalent Circuits of Linear Active Four-Terminal Networks — 



L. C. Peterson 593 



A Mathematical Theory of Communication (Concluded) — 



C. E. Shannon 623 



Transients in Mechanical Systems — /. T. Muller 657 



Maximally-Flat Filters in Wave Guide — W. W. Mumford 684 



Transient Response of an FM Receiver — M. K. Zinn 714 



Transverse Fields in Traveling-Wave Tubes — /. R. Pierce 732 



