ABSTRACTS OF TECHNICAL ARTICLES 257 



Simple Phase-Angle Measurement Technique. J. A. Rudisill, Jr.'. 

 Electronics, 25, pp. 228, 232, 236, September, 1952. 



Solid State Physics in Electronics and in Metallurgy. W. Shockley^ 

 Jl. Metals, 4, pp. 829-842, August, 1952. (Monograph 2011). 



Impurity Effects in the Thermal Conversion of Germanium. W. P. 

 Slichteri and E. D. Kolb^ Phys. Rev., 87, pp. 527-528, August 1, 1952. 



Traffic Engineering Design of Dial Telephone Exchanges. J. A. Stew- 

 art*. Midwest Engr., 4, pp. 3-5, 17-18, May, 1952. 



Single-Crystal Germanium. G. K. Teal^, M. Sparks^ and E. Buehler.^ 

 I.R.E., Proc, 40, pp. 906-909, August 1952. 



Significant advances have been made in the development of new types of 

 transistors, photocells, and rectifiers and in the improvement of the reproduci- 

 bihty and rehability of the point-contact transistor. A key factor in this de- 

 velopment has been the use of single-crystal germanium having a high degree of 

 lattice perfection and compositional control. Of particular interest to the device- 

 development engineer is the fact that the rectifying barriers between the p-type 

 and w-type sections behave in a manner predictable from the measured properties 

 of each section. The exceptionally long lifetime of injected carriers observed in 

 the material and the high degree of control over its chemical composition make 

 it ideally suitable for the production of p-n structures. The ranges of properties 

 of germanium single crystals which are now reahzable are given, as well as their 

 present degree of control. 



Lead-Acid Stationary Batteries. U. B. Thomas^ Electrochem. Soc. JL, 

 99, pp. 238C-241C, September, 1952. 



Polymorphism of NDJ)2P0^. E. A. WoodS W. J. Merz^ and B. T. 

 Matthias^. Phys. Rev., 87, p. 544, August 1, 1952. 



Lightning Protection for Mobile Radio Fixed Stations. D. W. Bodle^ 

 I.R.E. Trans., P.G.V.C.-l, pp. 122-133, February, 1952. 



Equipment in fixed stations of a mobile radio system is susceptible to damage 

 from Hghtning strokes to either the antennas or the connecting power and land 

 communication facilities unless special protection is provided. The problem, 

 however, is not alone one of protecting the station equipment, but consideration 

 must also be given to the protection of these connecting facihties to insure their 

 continuity of service. The causes of and factors affecting Hghtning damage are 

 discussed, including the probable incidence of strokes to the antennas. General 

 protection principles are outlined, and the appHcation of specific protection 

 methods is described. 



1 Bell Telephone Laboratories 



' Western Electric' Company 



* Illinois Bell Telephone Company 



