References

1. American Standard Definitions of Electrical Terms. A.I.E.E., 1941.

2. JOHNSON, K. S. Transmission Circuits for Telephonic Communication. D. Van Nostrand Co.

3. RHODES, F. L. Beginnings of Telephony. Harper & Bros.

4. KLOEFFLER, R. G. Telephone Communication Systems. The Macmillan Co.

5. SHEPARDSON, G. D. Telephone Apparatus. D. Appleton & Co.

6. GIBBON, C. 0. An Explanation of the Common Battery Anti-Sidetone Subscriber Set. Bell System Tech. J., April, 1938, Vol. 17, No. 2.

7. PYE, H. C. Transmission Characteristics of Types 40 and 50 Monophones. Strowger Technical Journal, December, 1939, Vol. 8, No. 2.

8. INGLIS, A. H. Transmission Features of the New Telephone Sets. Elec. Eng., October, 1938, Vol. 57, No. 10.

9. JONES, W. C. Instruments for the New Telephone Sets. Elec. Eng., October, 1938, Vol. 57, No. 10.

10. X-ray Story of the Kellogg Masterphone. Kellogg Switchboard and Supply Co.

11. COLPITTS, E. H. Scientific Research Applied to the Telephone Transmitter and Receiver. Bell System Tech. J., July, 1937, Vol. 16, No. 3.

12. INGRAM, S. B. The 313A Vacuum Tube. Bell Lab. Record, December, 1936, Vol. 15, No. 4.

13. INGRAM, S. B. Cold-cathode Gas-filled Tubes as Circuit Elements. Elec. Eng., July, 1939, Vol. 58, No. 7.

14. Bell Lab. Record, January, 1943, Vol. 21, No. 5, p. vi.

15. GHERARDI, B., and F. B. JEWETT. Telephone Communication Systems of the United States. Bell System Tech. J., January, 1930, Vol. 9, No. 1.

16. SPENCER, C. G. The Manual Tandem Board. Bell Lab. Record, January, 1930, Vol. 8, No. 5.

17. BRONSON, F. M. Tandem Operation in the Bell System. Bell System Tech. J., July, 1936, Vol. 15, No. 3.

18. SMITH, A. B., and W. L. CAMPBELL. Automatic Telephony. McGraw-HiJl Book Co.

19. CRAFT, E. B., L. F. MORE HOUSE, and H. P. CHARLESWORTH. Machine Switching Telephone System for Large Metropolitan Areas. Bell System Tech. J. April, 1923, Vol. 2, No. 2.

20. The Selector. Bulletin 808, Automatic Electric Co.

21. The Connector. Bulletin 807, Automatic Electric Co.

22. DODGE, W. L. Development of Step-by-step Line Finders, Bell Lab. Record, February, 1929, Vol. 7, No. 6.

23. BUTZ, E. D. An Outline of Step-by-step Operation. Bell Lab. Record, December, 1929, Vol. 8, No. 4.

24. HATTON, W. Operating Principles of the 7-A2 Rotary System. Elec. Commun., September, 1936, Vol. 23, No. 3.

25. HATTON, W. Rotary Automatic Telephone System. Elec. Eng., July, 1948, Vol. 67, No. 7.

26. COLLIS, R. E. The Panel System. Bell Lab. Record, July, 1931, Vol. 9, No. 11.

27. SCUDDER, F. J., and J. N. REYNOLDS. Crossbar Dial Telephone Switching System. Elec. Eng., May, 1939, Vol. 58, No. 5.

28. Crossbar. A series of articles reprinted from Bell Lab. Record, Vol. 17, 1939.

29. REYNOLDS, J. N. The Crossbar Switch. Bell Lab. Record, July, 1937, Vol. 15, No. 11.