Contributors to this Issue 



Julian Blanchard, A.B., Trinity College (now Duke University), 1905; 

 A.M., Columbia University, 1909; Ph.D., 1917. Professor of Engineering, 

 Trinity College, 1909-1912; Research Assistant in Physics, Columbia Uni- 

 versity, 1912-1915. Physicist, Research Laboratory, Eastman Kodak 

 Company, 1915-1917; Engineering Department, Western Electric Com- 

 pany, 1917-1925; Bell Telephone Laboratories, 1925-. Dr. Blanchard's 

 work has been concerned primarily with special studies in connection with 

 the development of vacuum tubes and radio. More recently he has been 

 attached to the Technical Consulting Staff of the Laboratories. 



G. M. BouTON, Ch.E., Brooklyn Polytechnic Institute, 1926. Bell 

 Telephone Laboratories, 1926-. Mr. Bouton is in charge of a group con- 

 cerned primarily with the metallurgy of lead cable sheath alloys and solders 

 and with general microscopic examination of metallic materials. 



W. P. Mason, B.S. in Electrical Engineering, University of Kansas, 

 1921; M.A., Columbia University, 1924; Ph.D., 1928. Bell Telephone 

 Laboratories, 192 1-. Dr. Mason has been engaged in investigations on 

 carrier systems and in work on wave transmission networks both electrical 

 and mechanical. He is now head of the department investigating piezo- 

 electric crystals. 



Earle E. Schumacher, B.S., University of Michigan; Research Assis- 

 tant in Chemistry, 1916-18. Engineering Department, Western Electric 

 Company, 1918-25; Bell Telephone Laboratories, 1925-. As Associate 

 Research Metallurgist, Mr. Schumacher is in charge of a group whose 

 work relates largely to research studies on metals and alloys. 



Roger I. Wilkinson, B.S. in E.E., Iowa State College, 1924. North- 

 western Bell Telephone Company, 1920-1921; American Telephone and 

 Telegraph Company, 1924-1934; Bell Telephone Laboratories, Inc., 19^4-. 

 Mr. Wilkinson has studied principally the application to telephone prob- 

 lems of the mathematical theory of probability. 



442 



