iv bell system technical journal 



': /: ; * \ '/: '".'', ':..'* ^ }• . ■ ^Octobsr, 1950 



l^eory D.f 'Relatian Jjetwqej^ tiol-e Concentration and Characteristics 



ol Cjefmanium i\n.nl.i^6niVLQti—J. Bardeen 469 



Design Factors of t.!ie.Bell Telephone Laboratories 155v3 Triode — /. A. 



Morion and^^.^M"- Ryder 496 



A New Microwave Triode: Its Performance as a Modulator and as an 



Ampliller — A. E. Bowen and W. W. Mumford 531 



A Wide Range Microwave Sweeping Oscillator — M. E. Hines 553 



Theory of the Flow of Electrons and Holes in (iermanium and Other 



Semiconductors — W. van Roosbroeck 560 



Traveling-Wave Tubes [Fourth Installment] — /. R. Pierce 608 



