Contributors to this Issue 



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

 of Paris, 1911-12, University of Berlin, 1912; Ph.D. in Physics and 

 Mathematics, University of Chicago, 1917; Engineering Department, 

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

 1925-. Dr. Darrow has been engaged largely in writing studies 

 and analyses of various fields of physics and the allied sciences. Some 

 of his earlier articles on Contemporary Physics form the nucleus of 

 a recently published book entitled "Introduction to Contemporary 

 Physics" (D. Van Nostrand Company). 



H. F. Dodge, S.B., Massachusetts Institute of Technology, 1916; 

 Instructor, Electrical Engineering, 1916-17; A.M., Columbia Uni- 

 versity, 1922; Engineering Department, Western Electric Company, 

 1917-25; Bell Telephone Laboratories, 1925-. Mr. Dodge was 

 earlier associated with the development of telephone instruments and 

 allied devices, and is now engaged in development work relating to 

 the application of statistical methods to inspection engineering. 



Harvey Fletcher, B.Sc, Brigham Young, 1907; Ph.D., Chicago, 

 1911; Instructor of Physics, Brigham Young, 1907-08 and Chicago, 

 1909-10; Professor, Brigham Young, 1911-16; Engineering Depart- 

 ment, Western Electric Company, 1916-25; Bell Telephone Labora- 

 tories, 1925-. During recent years. Dr. Fletcher has conducted 

 extensive investigations in the fields of speech and audition. 



Edward C. Molina, Engineering Department of the American 

 Telephone and Telegraph Company, 1901-19; Department of Develop- 

 ment and Research, 1919-. Mr. Molina has been closely associated 

 with the application of the mathematical theory of probabilities to 

 trunking problems and has taken out several important patents 

 relating to machine switching. 



H. G. RoMiG, A.B., Pacific University, 1921 ; University of Washing- 

 ton, 1922; A.M., University of California, 1923; Teaching Fellow in 

 Physics, University of California, 1922-24; Instructor in Mathematics 

 and Physics, San Jose State Teachers College, 1924-26; Bell Telephone 

 Laboratories, 1926-. Mr. Romig is engaged in development work 

 relating to the application of statistical methods to inspection engi- 

 neering. 



L. J. SiviAN, A.B., Cornell University, 1916; Engineering Depart- 

 ment, Western Electric Company, 1917-1919 and 1920-1925; Bell 

 Telephone Laboratories, 1925-. Mr. Sivian's work is in acoustics, 

 chiefly in connection with methods of electroacoustic measurements. 



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