ARTICLES BY BELL SYSTEM AUTHORS 463 



Abstract — The broad features of operation of the LI Coaxial System for 

 the transmission of television have been discussed in a recent paper (L. G. 

 Abraham, "Progress in Coaxial Telephone and Television Systems", AIEE 

 Transactions, Vol. 67, pp. 1520-1527, 1948). It is the purpose of this paper 

 to describe, in somewhat more detail, the factors influencing the design of 

 the coaxial television terminals and the features of the equipment now in 

 service in the Bell System's Television Network. The television terminals 

 here described were placed into network service in 1947, but in basic form 

 are similar to experimental models developed prior to the war and used in 

 early television transmission studies over the coaxial cable. 



Alternate to Lead Sheath for Telephone Cables. A. Paone.^ Corrosion, V. 6, 

 pp. 46-50, February, 1950. 



Bridge Erosion in Electrical Contacts and Its Prevention* W. G. Pfann.^ 

 A .I.E.E., Trans., V. 67, pt. 2, pp. 1528-1533, 1948. 



Abstract — The size of the molten bridge which forms as two contacts 

 separate depends upon the contact material and the current. The molten 

 bridge has two diameters, one in each contact. By pairing dissimilar con- 

 tact materials an asymmetric bridge is created, in which the bridge diam- 

 eters are unequal and with which is associated a self-limiting transfer 

 tendency. Under certain conditions the use of unlike pairs can prevent the 

 continued transfer of material from one contact to the other. 



Chess-playing Machine.* C. E. Shannon.^ Sci. Am., V. 182, pp. 48-51, 

 February, 1950. 



Military Teletypewriter Systems of World War II.* F. J. Singer.^ Bibli- 

 ography. A.I.E.E., Trans., V. 67, pt. 2, pp. 1398-1408, 1948. 



Abstract — This paper reviews the evolution of military teletypewriter 

 communications since 1941 and briefly describes some of the important sys- 

 tems that were developed during the war by Bell Telephone System engi- 

 neers for the armed forces. 



Optimum Coaxial Diameters.* P. H. Smith. ^ Electronics, V. 23, pp. Hi- 

 ll 2, 114, February, 1950. 



Abstract — The derivation of the optimum ratios is briefly described and 

 optimum values are indicated to one part in ten thousand. In all cases the 

 medium between conductors is assumed to be a gas with a dielectric con- 

 stant approaching unity, and any effect of inner conductor supports upon 

 the optimum conductor diameter ratio for a given property has been neg- 

 lected. 



General Review of Linear Varying Parameter and Nonlinear Circuit Analy- 

 sis.* W. R. Bennett. 1 I.R.E., Proc, V. 38, pp. 259-263, March, 1950. 



*JA reprint of this article may be obtained on request to the editor of the B. S.T.J. 



iB.T.L. 



^A. T. &T. 



