Abstracts of Bell System Technical Papers* 

 Not Published in This Journal 



Anderson, P. W/ 



Concept of Spin-Lattice Relaxation in Ferromagnetic Materials, Letter 

 to the Editor, Phys. Rev., 88, pp. 1214, Dec. 1, 1952. 



Balashek, S., see K. H. Davis. 



Band, W., see R. A. Nelson. 



Beach, A. L., see J. J. Lander. 



Bell Telephone Laboratories Transistor Teachers Summer School. 

 Experimental Verification of the Relationship Between Diffusion Con- 

 stant and Mobility of Electrons and Holes, Phys. Rev., 88, pp. 1368- 

 1369, Dec. 15, 1952. 



The relationship between diffusion constant and mobility, called the Einstein 

 relationship has been experimentally verified for electrons and holes in ger- 

 manium. This has been accomplished by measuring the rate of increase in 

 half concentration width of a pulse of minority carriers moving in an electric 

 field. 



BiDDULPH, R., see K. H. Davis. 



Bridgman, D. C.^ 



College Graduates and the Country's Telephone Industry, Jl. College 

 Placement, 13, pp. 19-27, Oct., 1952. 



Bullington, K.^ 



Radio Transmission Beyond the Horizon in the 40- to 4,000-Mc Band, 

 I.R.E., Proc, 41, pp. 132-135, Jan., 1953. (Monograph 2060). 

 ReHable signals have been received at distances of several hundred miles 

 at frequencies of 500 and 3,700 mc. The median signal levels are 50 to 90 



* Certain of these papers are available as Bell System Monographs and may be 

 obtained on request to the Publication Department, Bell Telephone Laboratories, 

 Inc., 463 West Street, New York 14, N. Y. For papers available in this form, the 

 monograph number is given in parentheses following the date of publication, and 

 this number should be given in all requests. 



^ Bell Telephone Laboratories, Inc. 



2 American Telephone and Telegraph Company. 



767 



