476 THE BELL SYSTEM TECHNICAL JOURNAL, APRIL 1951 



Mechanism of Magnetization and Alnico V. E. A. Nesbitt^ and H. J. 

 WiLLiAMS.i Letter to the editor. Phys. Rev., v. 80, pp. 112-113, Oct. 1, 1950. 



The P-Germanium Transistor.* W. G. PfannI and J. H. Scafe.i I.R.E. 

 Proc, V. 38, pp. 1151-1154, Oct., 1950. 



Abstract — The transistor effect in p-type germanium is discussed and some 

 properties are given for p-germanium transistors made in the laboratory. 

 These exhibit higher cutoff frequency and somewhat lower current multipli- 

 cation than their n-germanium counterparts. Under certain conditions a 

 negative resistance "snap" effect is observed which is apparently peculiar 

 to p-type germanium. Both types of transistor are governed by the same 

 physical principles but they differ in the signs of the emitted carriers and of 

 the bias voltages. 



Transistor as a Reversible Amplifier. W. G. Pfann.^ Letter to the editor. 

 r.R.E., Proc, V. 38, p. 1222, Oct., 1950. 



Electronics. J. R. Pierce.^ Sci. Am., v. 183, pp. 30-39, Oct., 1950. 



Abstract — A general account of the means by which the smallest funda- 

 mental particles are manipulated to accomplish many subtle tasks of our 

 technological civilization. 



Millimeter Waves.* J. R. Pierce.^ Physics Today, v. 3, pp. 24-29, Nov., 

 1950. 



Abstract — Lying between the longest infrared rays and the shortest micro- 

 waves of the electromagnetic radiation is the region of millimeter waves, 

 which are difficult to produce and to measure and which have as yet found 

 few applications. The millimeter wave range, a relatively undeveloped field 

 for research, presents a challenge to theoreticians, experimentalists, and in- 

 ventors alike. This article was prepared at the request and through the co- 

 operative effort of the ONRD advisory committee on millimeter wave 

 generation as a means for stimulating effort in this new field. 



Note on Stability of Electron Flow in the Presence of Positive Ions. J. R. 

 Pierce.' Letter to the editor. .//. Applied Phys., v. 21, p. 1063, Oct., 1950. 



Communications Metallurgy.* E. E. Schumacher.' Delivered at annual 

 autumn meeting of the Institute of Metals at Bournemouth, Sept. 18, 1950. 

 Inst. Metals, Jl., v. 18, pp. 1-23, Sept., 1950. 



Abstract— The lecture describes the function of the metallurgical depart- 

 ment in a communications system. The need for metallurgical research and 

 development, the origin of metals problems, the requirements imposed on 

 metal components, and the integration of metallurgical developments into 

 an operating communications system are given emphasis. It is shown how 



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

 » B. T. L. 



