iv BELL SYSTEM TECHNICAL JOURNAL 



A Precise Direct Reading Phase and Transmission Measuring System 



for Video Frequencies — D. A. Alsberg and D. Leed 221 



Physical Principles Involved in Transistor Action — J. Bardeen and 



W. H. Bratlain 239 



Lightning Current Observations in Buried Cable — H. M. Trueblood 



and E. D. Sunde 278 



The Electrostatic Field in Vacuum Tubes with Arbitrarily Spaced 



Elements — W. R. Bennett and L. C. Peterson 303 



Transconductance as a Criterion of Electron Tube Performance — T. 



Slonczewski 315 



July, 1949 



Editorial Note regarding Semiconductors 335 



Hole Injection in Germanium — Quantitative Studies and Filamentary 



Transistors — W. Shockley, G. L. Pearson and J. R. Haynes 344 



Some Circuit Aspects of the Transistor — R. M. Ryder and R. J. 



Kircher 367 



Theory of Transient Phenomena in the Transport of Holes in an Excess 



Semiconductor^ — Conyers Herring .- . 401 



On the Theory of the A-C. Impedance of a Contact Rectifier — /. 



Bardeen 428 



The Theory of p-n Junctions in Semiconductors and p-n Junction 



Transitors — IF. Shockley 435 



Band Width and Transmission Performance — C. B. Feldman and W. R. 



Bennett 490 



October, 1949 



Reactance Tube Modulation of Phase Shift Oscillators — F. R. Dennis 



and E. P. Fetch 601 



A Broad-Band Microwave Noise Source — IF. IF. Mumford 608 



Electronic Admittances of Parallel-Plane Electron Tubes at 4000 Mega- 

 cycles — Sloan D. Robertson 619 



Passive Four-Pole Admittances of Microwave Triodes — Sloan D. 



Robertson 647 



Communication Theory of Secrecy Systems — C. E. Shannon 656 



The Design of Reactive Equalizers — A. P. Brogle, Jr 716 



