574 BELL SYSTEM TECHNICAL JOURNAL 



8 "The Use of the Triode Valve in Maintaining the Vibration of a Tuning Fork," 



W. H. Eccles, Physical Society {London) Proceedings, v. 31, 1918-19, pp. 269. 



9 "Frequency Measurement in Electrical Communication," J. W. Horton, N. H. 



Ricker, and VV. A. Marrison, A. I. E. E. Transactions, v. 42, June 1923, pp. 



10 "Precision Determination of Frequency," J. W. Horton and VV. A. Marrison, 



I.R.E. Proceedings, v. 16, Feb. 1928, pp. 137-54. 



11 "Thermostat Design for Frequency Standards," W. A. Marrison, 7. R. E. Proceed- 



ings, V. 16, Julv 1928, pp. 976-80. 



12. "Long Distance telephone Circuits in Cable," A. B. Clark and H. S. Osborne, 



Bell System Technical Journal, v. 11, Oct. 1932, pp. 520-45. 



13. "The Transmission Characteristics of Open Wire Telephone Lmes,' E. I. Green, 



Bell System Technical Journal, v. 9, Oct. 1930, pp. 730-59. ..,,,„ 



14. "Phase Distortion and Phase Distortion Correction," Salhe P. Mead, Bell System 



Technical Journal, v. 7, April 1928, pp. 195-224. 



