ABSTRACTS OF TECHNICAL ARTICLES 1017 



ti'ansient response to step functions; frequency chai'actoi-istics of gain, pliase, 

 impedance and their frequency derivatives; and amplitude characteristics of 

 outi)ut nonlinoarity and of intermodulation products. 



Aluminum Die Castings — The Effect of Process Variables on Their 

 Properties. W. Babington^ and D. TT. KleppingerI Proc. A.S.T.M., 

 51, pp. 169-197, 1951. 



Diffusion in Alloys and the Kirkendall Effect. J. Bardeen^ and C. 

 Herring^ pp. 261-288 of Imperfections in Nearly Perfect Crystals, Wiley 

 X. Y., 1952, 490 p. Edited by W. Shockley, J. H., HoUomon, R. Maurer 

 and F. Seitz. Symposium held at Pocono Manor, Oct. 12-14, 1950, by 

 Committee on Solids, National Research Council. 



Lighlning Protection for Fixed Radio Stations. D. W. Bodle . Tele- 

 Terh, 11, pp. 58-60, 126+ , June, 1952. 



Common fi;rounds, parallel conducting paths, and discharge gai)s provide 

 tlii-ee important means for avoiding equipment damage from high current surges. 

 Protection of connecting facilities must also be considered to preserve service. 



Compression Tests on Lead Alloys at Extrusion Temperatures. G. M. 

 Bouton' and G. S. Phipps'. Proc. A.S.T.M., v. 51, pp. 761-770, 1951. 



Load-deflection measurements made during compression tests on lead and 

 lead-alloy cylinders at various temperatures show the effects of alloying in- 

 gredients on the force required to produce deformation. The curves also furnish 

 clues as to changes taking place in the materials during the course of the test. 

 The load, P, to produce definite small deformation in pure lead at various tem- 

 peratures, T, are shown to follow the relationship P = Ae"^"^, where A and B 

 are constants for the material. This is the same relationship found by others in 

 extrusion studies. The elements added to lead were those most commonly used 

 in the manufacture of cable sheath, namely, antimony, arsenic, bismuth, silver, 

 tellurium, and tin. The results show that the stronger alloys now used for cable 

 sheathing deform less readily at extrusion temperatures than pure lead or the 

 weaker alloys. 



RF Phase Control in Pulsed Ma(jnetro7is. E. E. David, Jr'. Proc. 

 I.R.E., 40, pp. 669-685, June, 1952. 



This pajDer describes the behavior of a magnetron oscillator started in the 

 l)resence of an externally applied rf exciting signal whose frequency is not greatly 

 different from the unperturbed steady-state frequency of the magnetron. 



Effect of Prior Strain at Low Temperatures on the Properties of Some 

 Close-Packed Metals at Room Temperature. W. C. Ellis^ and E. S. 

 Greiner . J. Metals, 4, pp. 648-651, June, 1952. (Monograph 1966). 



' Bell Telephone Laboratories 



^ Frankford Arsenal, Philadelphia, Pa. 



