Abstracts of Bell System Technical Papers Not Published 

 in This Journal 



A Full Automatic Private Line Teletypewriter Switching System."^ W. M. 

 Bacon^ and G. A. Locke.^ Elec. Engg., v. 70, pp. 408-413, May, 1951. 



Abstract — A full automatic teletypewriter message switching system 

 has been developed for use in private line networks involving one or more 

 switching centers and a multiplicity of local or long distance lines, each of 

 which may have one or more stations. This system provides fast teletype- 

 writer communication from any station to any other station or group of 

 stations in the network. 



Crossbar Tandem System.* R. E. Collis.^ AJ.E.E., Trans., v. 69, pt. 2, 

 pp. 997-1004, 1950. 



A Study of Nuclear and Electronic Magnetic Resonance.* K. K. Darrow.^ 

 Elec. Engg., v. 70, pp. 401-404, May, 1951. 



Abstract — Since the discovery of magnetic resonance in solids, liquids, 

 and gases in 1945, the phenomenon has been used in the determination of 

 nuclear magnetic moments and magnetic field strengths, as well as in the 

 study of crystal structure and relaxation times. 



The Genesis of Submarine Cables. L. Espenschied.^ Bibliography. Elec. 

 Engg., 70, pp. 379-383, May, 1951. 



Abstract — It was a century ago that the first submarine cable was laid 

 between Dover and Calais. To mark this centenary the author reviews 

 some of the events leading up to this achievement which made possible 

 further advances in the communications field, such as laying of the trans- 

 atlantic cable by the Great Eastern escorted by four ships, as shown in 

 the picture. 



Borocarbon Film Resistors. R. O. Grisdale,^ A. C. Pfister^, and G. K. 

 Teal.^ Natl. Electronics Conference, Proc. v. 6, pp. 441-442, 1950. 



Abstract — The carbon film type of resistor is particularly useful at high 

 frequencies, for not only can it be made to have small reactance but it is, 

 in effect, all skin so that there is no increase in resistance at high frequencies 

 due to skin effect. The film is also well cooled through its intimate contact 

 with the core and this makes possible the dissipation of large amounts 

 of power per unit area. While primarily developed for high frequency ap- 

 plications in this country, the pyrolytic carbon resistor possesses other 



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

 » Bell Tel. Labs. 



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