ABSTRACTS OF TECHNICAL ARTICLES 1263 



Pearson, G. L./ and M. Tanenbaum' 



Magnetoresistance Effect in InSb. Letter to the Editor, Phys Rev 

 90, p. 153, Apr. 1, 1953. 



PUGH, S. G 



Southern Bell Switches to Chemical Brush Control, Elec World 

 139, pp. 122-123, Mar. 23, 1953. 



If properly planned and executed, chemical control costs less in time and 

 money and does a better job. 



Ralston, R. W.* and B. D. Wickline* 



Television Coverage of the National Political Conventions, A.I.E.E. 

 Trans. Commun. and Electronics Sect. 5, pp. 1-14, Mar., 1953, and 

 Elec. Eng., 72, pp. 383-389, May, 1953. 



The first large-scale television coverage of both national political conventions 

 occurred last year in Chicago and this presented many new problems to the 

 telephone company of that city. Special video conductors and amplifiers 

 were used in eight of the 19 channels to the amphitheatre and microwave 

 facilities for the rest. 



Shive, J. N.' 



Properties of Germanium Phototransistors, J. Opt. Soc. Am., 43, 

 pp. 239-244, Apr., 1953 (Monograph 2103). 



This paper describes, summarizes, and compares the properties of three 

 photoelectric devices, namely: point contact phototransistors, p-n junction 

 phototransistors, and n-p-n junction multiplier phototransistors, which have 

 resulted from the prosecution of the transistor program at Bell Telephone 

 Laboratories. The first of these devices is characterized by a comparatively 

 high dark current and a quantum yield of 3 or 4 electrons per quantum. 

 The second has a dark current in the microampere range and a quantum 

 yield of approximately unity. The n-p-n device has a sensitivity correspond- 

 ing at best to a quantum yield of several hundred electrons per quantum. 

 All these devices have long-wave thresholds around 1.8 microns. The struc- 

 tures lend themselves readily to miniature encapsulation. 



Shockley, W., see T. S. Benedict. 



1 Bell Telephone Laboratories. 



* Illinois Bell Telephone Company. 



« Southern Bell Telephone Company. 



