114 BELL SYSTEM TECHNICAL JOURNAL 



The pattern is that of a mass of minute crystallites which have been 

 rotated about an axis in the surface normal to the direction of filing, 

 and in the sense determined by imaginary rollers which would be turned 

 by slipping on the (0 1 0) plane. The magnitude of the rotation varies 

 for different crystallites over a range from 5 to about 35 degrees. By 

 alternate etching and examination by electron diffraction it is found 

 that this layer of rotated crystallites extends beneath the surface to a 

 depth of 0.003 mm. 



Rotation of crystallites accompanying slip along slip planes is the 

 mechanism reported to account for strain hardening in metals. This 

 same rotation is observed in the present experiments on galena. It 

 seems altogether possible that the simple technique of these experi- 

 ments can be applied directly to study the disturbance in surface layers 

 of metal crystals produced by abrasion. It may thus be a useful way 

 of studying strain hardening in metals. 



The Photoelectric Cell and Its Method of Operation} M. F. Jamieson, 

 T. E. Shea, and P. H. Pierce. This paper gives a simple description 

 of the laws governing the release of electrons from photoelectric 

 surfaces, their collection at anodes, and the creation of ions in photo- 

 electric cell gases by the "ionization" process, and discusses questions 

 of spectral selectivity of various photoelectric surfaces, the influence of 

 spectral characteristics of illumination, and the dynamic characteristics 

 of vacuum and gas-filled cells. 



Modified Sommerf eld's Integral and Its Applications} S. A. Schel- 

 KUNOFF. The purpose of this paper is to obtain a certain integral 

 expressing the fundamental wave function and with the aid of this 

 integral to calculate the radiation resistances of small doublets and 

 small loops placed inside an infinite hollow cylinder. Some applica- 

 tions of this integral to calculation of radiation from parallel wires in 

 free space are also discussed. 



Diffusio?i of Water Through Insulating Materials} R. L. Taylor, 

 D. B. Herrmann, and A. R. Kemp. Data are presented on the rate of 

 water diffusion through various organic materials. A diffusion con- 

 stant based on Kick's linear diffusion law is calculated for each material. 

 Several equations are derived from Pick's law to show how valuable 

 information can be obtained in connection with practical problems. 



3 Jour. S. M. P. E., October, 1936. 



^Proc. L R. E., October, 1936. 



^ Indus, and Engg. Chem., November, 1936. 



