Contributors to This Issue 



Joseph A. Becker, A.B., Cornell University, 1918; Ph.D., Cornell 

 University, 1922. National Research Fellow, California Institute of Tech- 

 nology, 1922-24; Assistant Professor of Physics, Stanford University, 1924. 

 Engineering Department, Western Electric Company, 1924-25; Bell Tele- 

 phone Laboratories, 1925-. Dr. Becker has worked in the fields of X-rays, 

 magnetism, thermionic emission and adsorption, particularly in oxide coated 

 filaments, and the properties of semiconductors as applied in varistors, ther- 

 mistors and transistors. 



R. M. BozoRTH, A.B., Reed College, 1917; U. S. Army, 1917-19; Ph.D. in 

 Physical Chemistry, California Institute of Technology, 1922; Research 

 Fellow in the Institute, 1922-23. Bell Telephone Laboratories, 1923-. As 

 Research Physicist, Dr. Bozorth is engaged in research work in magnetics. 



C. J. Calbick, B.Sc. in E.E., State College of Washington, 1925; M.A. in 

 Physics, Columbia, 1928. Bell Telephone Laboratories, 1925-. Here he has 

 been engaged in the study of thin films on thermionic cathodes, electron 

 diffraction problems, electron optics and microscopy, and in the development 

 of high quahty cathode-ray tubes for television reception. Member of 

 American Physical Society, American Crystallographic Association, the 

 Electron Microscope Society of America, the New York Microscopical 

 Society and the I.R.E. 



Karl K. Darrow, B.S., University of Chicago, 1911; University of Paris, 

 1911-12; University of Berlin, 1912; Ph.D., University of Chicago, 1917. 

 Western Electric Company, 1917-25; Bell Telephone Laboratories, 1925-. 

 As Research Physicist, Dr. Darrow has been engaged largely in writing on 

 various fields of physics and the allied sciences. 



L. H. Germer, B.A., Cornell, 1917; M.A., Columbia, 1927; Ph.D., Colum- 

 bia, 1927. Bell Telephone Laboratories, 191 7-. With the Research Depart- 

 ment, Dr. Germer has been concerned with studies in electron scattering and 

 diffraction, surface chemistry, order-disorder phenomena, contact physics 

 and physics of arc formation. Member of American Physical Society, the 

 American Crystallographic Society of which he was president in 1944, the 

 A.A.A.S., the New York Academy of Sciences and Sigma Xi. 



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