332 BELL SYSTEM TECHNICAL JOURNAL 



References 



1. "The New York-London Telephone Circuit," S. B. Wright and H. C. Silent, 



Bell System Technical Journal, Vol. VI, pp. 736-749, October, 1927. 



2. "Speech Power and Its Measurement," L. J. Sivian, Bell System Technical 



Journal, Vol. VIII, pp. 646-661, October, 1929. 



3. "Thermal Agitation of Electricity in Conductors," J. B. Johnson, Physical Review, 



Vol. 32, pp. 97-109, July, 1928. 



4. "Thermal Agitation of Electric Charge in Conductors," H. Nyquist; presented 



before the American Physical Society, February, 1927, and published in Physi- 

 cal Review, Vol. 32, pp. 110-113, July, 1928. 



5. "Two-Way Radio Telephone Circuits," S. B. Wright and D. Mitchell, Bell 



System Technical Journal, Vol. XI, pp. 368-382, July, 1932, and Proceedings 

 of The Institute of Radio Engineers, Vol. 20, pp. 1117-1130, July, 1932. 



6. U. S. Patent 1,565,548, December 15, 1925, issued to A. B. Clark. 



7. U. S. Patent 1,737,830, December 3, 1929, issued to George Crisson, 



8. U. S. Patent 1,738,000, December 3, 1929, issued to E. I. Green. 



9. U. S. Patent 1,757,729, May 6, 1930, issued to R. C. Mathes. 



