ABSTRACTS OF TECHNICAL ARTICLES 205 



Essential information for claculation of traveling-wave-tube gain is sum- 

 marized and condensed in this paper. The important relations are documented, 

 presented in a concise form for simplified computation, and developed as a 

 nomograph. The conclusions have been found to be in agreement with measure- 

 ments on six different tube designs. 



Thermal Variation of Younc/s Modulus in some Fe-Ni-Mo Alloys* 

 M. E. Fine' and W. C. Ellis'. References. Jl. Metals, 3, pp. 7GI-7G4, 

 Sept., 1951. 



A Broad-Band Transcontinental Radio Relay System.* T. J. Grieser^ 

 and A. C. Peterson^. Elec. Eng., 70, pp. 810-815, Sept., 1951. 



Spanning the continent from coast to coast, this microwave relay system 

 l)rovides six channels, each of which can carry one television circuit or hundreds 

 of telephone circuits. Some features of this vast network are descirbed. 



An Improved Telephone Set* A. H. Inglis' and W. L. Tuffnell^ 

 Elec. Eng., 70, pp. 770-775, Sept., 1951. 



The famihar telephone set has undergone numerous changes which will pro- 

 vide better service at lower cost than do present models. Increased transmitting 

 and receiving gain, better sidetone control, broader frequency response, faster 

 dialing, simple ringing control, and a trim appearance are some of the features 

 of the new design. 



The Institutes for Basic Research — Their Contribution to National 

 Strength. M. J. Kelly', pp. 11-23. Applied Research is Not Enough, 

 (booklet). Addresses at the Dedication of the Institutes for Basic Re- 

 search, The University of Chicago, May 16, 1951. 



The Crystal Clock. W. A. Marrison'. Science Marches On, James 

 Stokley, ed., N. Y., Ives Washburn, Inc., 1951, pp. 303-309. 



Observations of Zener Current in Germanium p-n Junctions. K. B. 

 McAfee', E. J. Ryder', W. Shockley', and M. Sparks'. Letter to the 

 Editor. Phys. Rev., 83, pp. 650-651, Aug. 1, 1951. 



Experimental Radio-Telephone Service for Train Passengers.* N. 

 Monk'. Proc. I.R.E., 39, pp. 873-881, Aug., 1951. 



Experimental public radio-telephone service for train passengers was in- 

 augurated by the Bell Telephone System several years ago. Initial installations 

 operated in conjunction with a series of urban mobile base stations. More re- 

 cently, highway mobile systems have been used for this service, and this i)aper 

 describes a typical train installation operating through a highway channel. All 



* A reprint of this article may be obtained on request. 

 1 Bell Tel. Labs. 



