160 BELL SYSTEM TECHNICAL JOURNAL 



191 7-. Mr. Ferguson's work has been in connection with the develop- 

 ment of methods of electrical measurement. 



C. J. Davisson, B.Sc, University of Chicago, 1908; Ph.D., Prince- 

 ton University, 1911; instructor in physics, Carnegie Institute of 

 Technology, 1911-17; research engineer. Western Electric Company 

 and Bell Telephone Laboratories, 1917 to date. Dr. Davisson's work 

 since coming with the Bell System has related largely to thermionics 

 and electronic physics. 



E. Peterson, Cornell University, 1911-14; Brooklyn Polytechnic, 

 E.E., 1917; Columbia, A.M., 1923, Ph.D., 1926; Electrical Testing 

 Laboratories, 1915-17; Signal Corps, U. S. Arm}', 1917-19; Engi- 

 neering Dept., Bell Telephone Laboratories, 1919-. 



C. R. Keith, B.S., 1922, California Institute of Technology; 

 M.A., 1925, Columbia University; Carrier Research Department, Bell 

 Telephone Laboratories, 1922-. Mr. Keith's work has related to the 

 study of vacuum tube and magnetic modulators and other carrier 

 apparatus. 



A. L. Thuras, B.S., University of Minnesota, 1912; E.E., 1913; 

 laboratory assistant with U. S. Bureau of Standards, 1913-16; grad- 

 uate student in physics. Harvard, 1916-17; scientific observer with U. 

 S. Coast Guard, 1917-19; oceanographer, 1919-20; Bell Telephone 

 Laboratories, 1920-. Since joining the Laboratories staff, Mr. Thuras' 

 work has had to do largely with mechanical impedance studies and 

 bridges. 



