586 BELL SYSTEM TECHNICAL JOURNAL 



75. Fractional frequency generators utilizing regenerative modulation, R, L. Miller 



/. R. E. Proc, V. 27, No. 7, pp. 446-457, July, 1939. 



76. Generation and control of electric waves, Joseph W. Horton. U. S. Patent No 



1,690,299, filed March, 1922, issued November, 1928. 



77. Piezoelectric crystal, Warren A. Marrison. U. S. Patent No. 1,899,163, filed Dec. 



1928, issued Feb., 1933. U. S. Patent No. 1,907,425, filed Dec, 1928, issued 

 May, 1933. U. S. Patent No. 1,907,426, filed Dec, 1928, issued May, 1933 

 U. S. Patent No. 1,907,427, filed Dec, 1928, issued May, 1933. 



78. A high precision standard of frequency, W. A. Marrison, /. R. E. Proc, v. 17, pp 



1103-1126, July, 1929. B. S. T. /., v. 8, pp. 493-514, July, 1929. 



79. The Crystal Clock, W. A. Marrison, National Academy of Sciences Proc, v. 16, pp 



496-507, July, 1930. 



80. Gravity measurements on the U. S. S. Barracuda, Maurice Ewing, Transactions of the 



American Geophysical Union, 1937. 



81. Gravity at sea by pendulum observations, Albert J. Hoskinson, American Institute of 



Mining and Metallurgical Engineers Technical Publication No. 955, New York 

 Meeting, 1938. 



82. Modern developments in precision clocks, Alfred L. Loomis and W. A. Marrison, 



A. I.E. E. Trans., v. 51, pp. 527-537, June, 1932. 



83. The precise measurement of time, A. L. Loomis, Monthly Notices, R. A. S., v. 91, 



March, 1931. 



84. The spark chronograph, W. A. Marrison, Bell Laboratories Record, v, 18, No. 2, pp. 



54^57, October, 1939. 



85. Quartz Crystals for Electrical Circuits, Raymond A. Heising. Book. D. Van 



Nostrand, Inc. New York, 1946. 



86. A new quartz crystal plate, designated the GT, which produces a very constant 



frequency over a wide temperature range. W. P. Mason. /. R. E. Proc, v. 

 28, No. 5, pp. 220-223, May, 1940. 



87. The bridge stabilized oscillator, L. A. Meacham, /. R. E. Proc, v. 26, No. 10, pp. 

 • 1278-1294, October, 1938. 



88. Time determination and time broadcast, J. F. Hellweg, Franklin Institute Jl. No. 



223, pp. 549-563, 1937. 



89. The measurement of time, Sir Harold Spencer Jones, Endeavour, v. 4, pp. 123-130, 



October, 1945. 



90. Translating Circuits. (A continuous phase shifter), W. A. Marrison. U. S. Patent 



No. 1,695,051, filed May, 1925, issued Dec, 1928. 



91. Standard Frequency System, W. A. Marrison. U. S. Patent No. 2,087,326, filed 



Sept., 1934, issued July, 1937. 



92. Phase Shifting Apparatus, Larned A. Meacham. U. S. Patent No. 2,004,613, filed 



Aug., 1933, issued June, 1935. 



93. A multiple unit steerable antenna for short wave reception, H. T. Friis and C. B. 



Feldman, Proc I. R. E., v. 25, pp. 841-915, July, 1937. 



94. Clocks showing mean and sidereal time simultaneously, F. Hope-Jones, Franklin 



Institute Jl. No. 223, pp. 95-100, January, 1937. 



95. Sur des horloges indiquant simultanement le temps solaire moyen et le temps sideral, 



Ernest Esclangon. Comptes Rendus, 206, pp. 289-292, January 31, 1938. 



96. Electrical Engineers' Handbook, Pender-Mcllwain. Chapter on Frequency 



Measurement by W. A. Marrison. John Wiley & Sons, Inc., New York; Chap- 

 man & Hall, Ltd., London. 



97. Frequency standard, W. A. Marrison. U. S. Patent No. 1,935,325, filed April, 1929, 



issued Nov., 1933. 



98. Frequency measurement, W. A. Marrison. U. S. Patent No. 1,936,683, filed Sept., 



1931, issued Nov., 1933. 



99. High precision frequency comparisons, L. A. Meacham. The Bridge of Eta Kappa 



Nu., v. 36, pp. 5-8, Feb.-March, 1940; also Bell System Technical Monograph 

 B-1232. 



100. An instrument for short-period frequency comparisons of great accuracy, H. B. Law, 



The Jl. of the Institution of Electrical Engineers, Vol. 94, Part III, No. 27, pp. 38- 

 41, January, 1947. 



101. Electron and Nuclear Counters — Theory and Use, Serge A. Korff. Book. D. Van 



Nostrand Company, Inc., New York, 1946. 



102. Electronic Counters, I. E. Grosdoff, R. C. A. Review, v. 7, No. 3, pp. 438-447, Sept., 



1946. 



