CONTRIBUTORS TO THIS ISSUE 185 



T. B. Crandall, A.B., Wisconsin, 1909; A.M., Princeton, 1910; 

 Ph.D., 1916; Professor of Physics and Chemistry, Chekiang Provincial 

 College, 1911-12; Engineering Department, Western Electric Com- 

 pany, 1913-24; Bell Telephone Laboratories, Inc., 1925-. Mr. 

 Crandall has published papers on infra-red spectroscopy, the con- 

 denser transmitter, thermophone, etc. More recently he has been 

 associated with studies on the nature and analysis of speech which 

 have been in progress in the Laboratory. 



Lloyd Espenschied, Pratt Institute, 1909; United Wireless Tele- 

 graph Company as radio operator, summers, 1907-08; Telefunken 

 Wireless Telegraph Company of America, assistant engineer, 1909-10; 

 American Telephone and Telegraph Company, Engineering De- 

 partment and Department of Development and Research, 1910-. 

 Took part in long distance radio telephone experiments from Washing- 

 ton to Hawaii and Paris, 1915 ; since then his work has been connected 

 with the development of radio and carrier systems. 



William J. Shackelton, B.S. in E.E., University of Michigan, 

 1909; Western Electric Company, Manufacturing and Installation 

 Department, 1909-10; Engineering Department, 1910-24; Bell 

 Telephone Laboratories, 1925-. Mr. Shackelton's principal ac- 

 tivities have been in connection with the design of loading coils and the 

 development of methods of high frequency measurement. 



