BELL SYSTEM TECHNICAL JOURNAL 



July, 1932 



Henry as an Electrical Pioneer — Bancroft Gherardi 327 



The Caesium-Oxygen-Silver Photoelectric Cell — 



C. H. Prescott, Jr., and M. J. Kelly 334 



Two-Way Radio Telephone Circuits — 5". B. Wright and D. Mitchell 368 

 Magnet Steels and Permanent Magnets — Relationships Among 



Their Magnetic Properties — K. L. Scott 383 



A Method of Measuring Acoustic Impedance — P. B. Planders . . . 402 

 Transmission Lines for Short-Wave Radio Systems — 



E. J. Sterha and C. B. Fcldinan 411 

 An Efficient Miniature Condenser Microphone System — 



H. C. Harrison and P. B. Flanders 451 



Wire Communication Aids to Air Transportation^//. H. Nance 462 



October, 1932 



World-Wide Telephony — Its Problems and Future — 



B. Gherardi and F. B. Jeivett 485 

 Long Distance Telephone Circuits in Cable — 



A. B. Clark and H. S. Osborne 520 

 The Conception and Demonstration of Electron Waves — 



C. /. Davisson 546 

 An Expansion for Laplacian Integrals in Terms of Incomplete 



Gamma Functions, and Some Applications — E. C. Molina . . . 563 

 Contemporary Advances in Physics, XXIV — High-Frequency 



Phenomena in Gases, First Part — Karl K. Darrozv 576 



Transformer Coupling Circuits for High-Frequency Amplifiers — 



A. J. Christopher 608 



