Contributors to This Issue 



Sidni:y Darlington, Harvard University, B.S. in Physics, 1928; Massa- 

 chusetts Institute of Technology, B.S. in E.E., 1929; Columbia University, 

 Ph.D. in Physics, 1940. Bell Telephone Laboratories, 1929-. Dr. Darlington 

 has been engaged in research in applied mathematics, with emphasis on net- 

 work theory. 



R. O. Grisdale, S.B., Harvard University, 1930. Bell Telephone Labora- 

 tories, 1930-. In the Chemical, Physical Research, Electronic Apparatus 

 Development, and Transmission Apparatus Development Departments, 

 Mr. Grisdale has been concerned with the development of varistors, thermis- 

 tors, ceramics, microphone carbon, carbon film resistors, wire coverings, 

 and dielectric materials. 



A. H. Inglis, B.A., Yale University, 1914. Western Electric Company, 

 Engineering Department, 1914-17. Signal Corps, A.E.F., 1917-19. American 

 Telephone and Telegraph Company, Department of Development and 

 Research, 1919-34; Bell Telephone Laboratories, 1934-. As Station In- 

 strumentalities Engineer, Mr. Inglis has been concerned with both equip- 

 ment and transmission matters of station apparatus. 



W. E. Kahl, Bell Telephone Laboratories, 1921-. Graduated in 1924 

 from the Student Assistants' Course given in the Laboratories. Prior to 

 World War II Mr. Kahl was engaged in the development of filters, equalizers 

 and other transmission networks used in various carrier systems, particu- 

 larly those for the Type C and Type J Systems. During the war he was con- 

 cerned with the development of airborne submarine detection equipment 

 under-water mine detection equipment, and special networks for Naval 

 Ordnance Laboratory projects. Immediately following the war he was active 

 as apparatus engineer for the Type ''M" Power Line Carrier System and 

 the N-1 Carrier System developments. Present activity is concerned with 

 the development of special networks for military application. 



W. H. Martin, A.B., Johns Hopkins University, 1909; S.B., Massa- 

 chusetts Institute of Technology, 1911. American Telephone and Telegraph 

 Company, Engineering Department, 1911-19; Department of Development 

 and Research, 1919-34. Bell Telephone Laboratories, 1934-. Now Vice 



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