BELL SYSTEM TECHNICAL JOURNAL 



July, 1938 



Hertz, the Discover of Electric Waves — Julian Blanchard 327 



Instruments for the New Telephone Sets — W. C. Jones 338 



Transmission Features of the New Telephone Sets^ — A. H. Inglis 358 

 Spectrochemical Analysis in Communication Research — 



Beverly L. Clarke and A. E. Ruehle 381 



High Speed Motion Picture Photography^ — W. Herriott 393 



An Optical Harmonic Analyzer — //. C. Montgomery 406 



Magnetic Shielding of Transformers at Audio Frequencies — 



W. G. Gustafson 416 



Coaxial Cable System for Television Transmission — M. E. Strieby 438 



Stabilized Feedback Oscillators — G. JL Stevenson 458 



The Discovery of Electron Waves — C. J. Davisson 475 



October, 1938 '^ 



Ultra-Short- Wave Transmission and Atmospheric Irregularities — 



C. R. Englund, A. B. Crawford and W. W. Mumford 489 



Amplitude Range Control—^. B. Wright 520 



Devices for Controlling Amplitude Characteristics of Telephonic 



Signals — A. C. Norwine 539 



The Exponential Transmission Line — Chas. R. Burrows 555 



The Bridge Stabilized Oscillator — L. A. Meacham 574 



Effect of Space Charge and Transit Time on the Shot Noise in 



Diodes—^. /. Rack 592 



Fundamentals of Teletypewriters Used in the Bell System — 



E. F. Watson 620 

 The Dielectric Properties of Insulating Materials — 



E. J. Murphy and S. 0. Morgan 640 



