BELL SYSTEM TECHNICAL JOURNAL 



JULY, 1934 



The Compandor — An Aid Against Static in Radio Telephony — 



R. C. Mathes and S. B. Wright 315 



The Effect of Background Noise in Shared Channel Broad- 

 casting — C. B. Aiken 3?)?) 



Wide-Band Open-Wire Program System — //. 5. Hamilton 351 



Line Filter for Program System — A. W. Clement 382 



Contemporary Advances in Physics, XXVIII — The Nucleus, 



Third Part— Xar/ K. Darrow 391 



Electrical Wave Filters Employing Quartz Crystals as Ele- 

 ments — W. P. Mason 405 



Some Improvements in Quartz Crystal Circuit Elements — 



F. R. Lack, G. W. Willard and I. E. Fair 453 



A Theory of Scanning and Its Relation to the Characteristics of 

 the Transmitted Signal in Telephotography and Television — 



Pierre Mertz and Frank Gray 464 



October, 1934 



An Extension of the Theory of Three-Electrode Vacuum Tube 



Circuits — S. A. Levin and Liss C. Peterson 523 



The Electromagnetic Theory of Coaxial Transmission Lines and 



Cylindrical Shields — S. A. Schelktinoff 532 



Contemporary Advances in Physics, XXVIII — The Nucleus, 



Third Part — Karl K. Darrow 580 



The Measurement and Reduction of Microphonic Noise in Vac- 

 uum Tubes — D. B. Penick 614 



Fluctuation Noise in Vacuum Tubes — G. L. Pearson 634 



Systems for Wide-Band Transmission Over Coaxial Lines — 



L. Espenschied and M. E. Striehy 654 



Regeneration Theory and Experiment — 



E. Peterson, J. G. Kreer and L. A. Ware 680 



