182 BELL SYSTEM TECHNICAL JOURNAL 



American Telephone and Telegraph Company, Engineering Depart- 

 ment and Department of Development and Research, 1910 — . Took 

 part in long distance radio telephone experiments from Washington 

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

 with the development of radio and carrier systems. 



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

 1911; instructor of physics, Brigham Young, 1907-08; Chicago, 

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

 ment, Western Electric Company, 1916 — . The present paper by 

 Dr. Fletcher gives some of the results of an investigation which is 

 being made of the relation between the frequency characteristics of 

 telephone circuits and the intelligibility of transmitted speech. Dr. 

 Fletcher has also published on Brownian movements, ionization and 

 electronics. 



