Abstracts of Technical Articles from Bell System Sources 



Determination of Ferromagnetic Anisotropy in Single Crystals and in 

 Polycrystalline Sheets} R. M. Bozorth. Following the work of 

 Akulov and of Heisenberg on the magnetic anisotropy of cubic crystals, 

 it is shown that by taking account of an additional term in the expres- 

 sion for the energy of magnetization the [110] direction may under 

 certain conditions be the direction for easiest magnetization in a 

 crystal, instead of [100] or [111] as given by previous theory. This 

 is in accord with experiment. Magnetization curves for single crystals 

 are calculated using the additional term and some peculiarities are 

 recorded. The anisotropy constant appropriate for a single crystal (of 

 iron) has been calculated from measurements on hard-rolled sheet in 

 which there is preferred orientation of the crystals. 



Impact Bend Testing of Wire} W. J. Farmer and D. A. S. Hale. 

 This paper comprises a discussion of a machine designed to make rapid 

 determination of the ability of wire to resist permanent deformation 

 by bending. 



Two types of machine used in the industry for wire bend testing are 

 described and their features discussed with regard to their suitability 

 for use as standard test methods. 



A bend tester operated by the impact of a pendulum has been de- 

 veloped by the Bell Telephone Laboratories in collaboration with 

 Subcommittee IV on Mechanical Tests of the Society's Committee B-4 

 on Electrical-Heating, Electrical-Resistance and Electric-Furnace 

 Alloys. Results of typical tests with this machine are given, together 

 with information gathered from ultra-rapid motion pictures taken of 

 the machine in operation. 



It is concluded that the impact bending machine described offers a 

 simple, rapid and accurate means of measuring the bending properties 

 of wire and that the information acquired from the test is directly 

 applicable to design problems. 



Positions of Stimulation in the Cochlea by Pure Tones? John C. 

 Steinberg. The relation between tone frequency and position of 



^Phys. Rev., December 1, 1936. 



"^ Proc. 39th Ann. Mtg. Amer. Soc. for Testing Materials, Vol. 36, 1936 — Part II, 

 Technical Papers. 



^ Jour. Acous. Soc. Amer., January, 1937. 



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