BlilJ. SYSTEM TECHNICAL JOURNAL 



July, 1930 



Radio Telephone Service to Ships at Sea — 



William Wilson and Lloyd Espcnschicd 407 

 A General Switching Plan for Telephone Toll Service — 



//. S. Osborne 429 

 Image Transmission System for Two- Way Television — 



Herbert E. Ives, Frank Gray and M. W. Baldwin 448 

 Synchronization System for Two-Way Television — H. M. Stollcr 470 

 Sound Transmission System for Two-Way Television — 



D. G. Blattner and L. G. BosHvick 478 

 Transmitted Frequency Range for Telephone Message Circuits — 



W. H. Martin 483 

 Some Recent Developments in Long Distance Cables in the United 



States of America— .4. B. Clark 487 



Phase Distortion in Telephone Apparatus — C. E. Lane 493 



Measurement of Phase Distortion — H. Nyqnist and S. Brand .... 522 

 Effects of Phase Distortion on Telephone Quality — 



John C. Steinberg 550 

 Long Distance Cable Circuit for Program Transmission — 



A. B. Clark and C. W. Green 567 



October, 1930 



Chemistry in the Telephone Industry — Robert R. Ullliains 603 



The Trend in the Design of Telephone Transmitters and Receiv- 

 ers— fi^. H. Martin and W. F. Davidson 622 



Mutual Impedances of Ground-Return Circuits — 



A. E. Boiven and C. L. Gilkeson 628 

 A Survey of Room Noise in Telephone Locations — 



W. J. Williams and Ralph G. MeCnrdy 652 



Contemporary Advances in Physics, XXI — Karl K. Darrozv 668 



A Study of Telephone Line Insulators — L. T. IVilson 697 



The Transmission Characteristics of Open-Wire Telephone Lines — 



E. L Green 730 

 Transients in Parallel Grounded Circuits, One of Which is of In- 

 finite Length — Liss C. Peterson 760 



Impedance Correction of Wave Filters — E. B. Payne 770 



A Method of Impedance Correction — //. W. Bode 794 



