Abstracts of Technical Articles From Bell System Sources (01 July 1929)

A Metallographic Study of Tungsten Carbide Alloys? J. L. GREGG and C. W. KUTTNER. This paper gives the results of an investigation of the structure of five of the tungsten-carbon alloys by means of microscopic and X-ray methods, the samples studied being small tools or wire-drawing dies. After a general discussion of the constituents of tungsten-carbon alloys, the preparation of the samples is described, and the structures found are shown in twenty-one figures accompanying the text. 1 2 3 Mining and Metallurgy, Vol. 10, March, 1929, p. 163 (abstract). Mining and Metallurgy, Vol. 10, March, 1929, p. 162 (abstract). 

Mining and Metallurgy, Vol. 10, February, 1929, p. 94 (abstract). 605 606 BELL SYSTEM 4 TECHNICAL JOURNAL Journal of the Optical Society of America and, Review of Scientific Instruments, Vol. 18, February, 1929, pp. 118-122. Journal of Physical Chemistry, Vol. 33, February, 1929, pp. 226-243. Wire & Wire Products, Vol. 4, April, 1929, pp. 118-119, 140. Transactions of the American Society for Steel Treating, Vol. 15, February, 1929, pp.339-364. 4 6 0 7 Motion Pictures in Relief. HERBERT E. IVES. In this article Dr. Ives describes the method by which stereoscopic motion picture projection can, theoretically at least, be attained. The method is relatively complicated and has severe practical limitations. It appears to be theoretically sound and capable of realization, at least on an experimental scale. The Absorption of Oxygen by Rubber. G . T. KOHMAN. The work reported in this paper was planned for the purpose of determining the part played by oxygen absorption in the natural aging of rubber.