evolution of inductive loading 1243 



Conclusion 



During the half century that has intervened since its invention, coil 

 loading has played a very important part in making nation-wide telephony 

 possible and in helping to make possible the great growth in the business 

 which has occurred. Although the application of coil loading to new circuits 

 has now been greatly curtailed, due in large part to the development of 

 carrier systems, coil loading still has an important field of application in 

 exchange area telephone plant and for some rather special circuit applica- 

 tions. 



The reader may take it for granted that the organization which has 

 developed and used loading to the maximum degree of utility in the present 

 telephone plant will be on the alert in the future to make full use of loading 

 in situations wherever loaded circuits provide a more economical solution 

 of the transmission service needs than the other available procedures. It is 

 also reasonable to expect that new types of loading and new loading ap- 

 paratus will be developed to the extent that may be economically war- 

 ranted. 



Bibliography {Concluded) 



23. H. D. Arnold and G. W. Elmen, "Permalloy, An Alloy of Remarkable Magnetic 

 Properties," Journal of the Franklin Institute, Vol. 195, 1923. 



42. W. H. Martin, G. A. Anderegg, and B. VV. Kendall, "Key West-Havana Submarine 



Cable System," Trans. A.LE.E., Vol. XLI, 1922. 



43. H. A. AfTel, W. S. Gorton, and R. VV. Chesnut, "A New Key West-Havana Carrier 



Telephone Cable," B.S.T.J., Vol. XI, April 1932. 



44. O. E. Buckley, "The Loaded Submarine Telegraph Cable," B.S.TJ., Vol. IV, July 



1925; Electrical Communication, Vol. 4, No. 1, 1925, Journal AJMJE., Vol. XLIV, 

 No. 8, 1925. 



45. O. E. Buckley, "High Speed Ocean Cable Telegraphy," 5.5.7./., Vol. VII, April 1928. 



Presented at the International Congress of Telegraphy and Telephony in Com- 

 memoration of Volta, Lake Como, Italy, September 1927. 



46. G. W. Elmen, "Magnetic Alloys of Iron, Nickel and Cobalt," //. Franklin Institute 



Vol. 207, p. 583, 1929. 



47. O. E. Buckley, "The Future of Transoceanic Telephony," The Thirty-third Kelvin 



Lecture of the Institution of Electrical Engineers, April 23, 1942; The Journal of 

 The Institution of Electrical Engineers, Vol. 89, Part 1, 1942. (Bell Laboratories 

 reprint, Monograph B-1346). 



48. H. S. Black, F. A. Brooks, A. J. Wier and J. G. Wilson, "An Improved Cable Carrier 



System," Trans. AJ.E.E., Vol. 66, 1947. 



In addition to the published articles referred to in the text or footnotes, the following 

 will be of interest: 

 W. Fondiller, "Commercial Loading of Telephone Cable," Electrical Communication, Vol. 



4, No. 1, July 1925. 

 George Crisson, "Irregularities in Loaded Telephone Circuits," B.S.T.J., Vol. IV, October 



1925. 

 F. L. Rhodes, "Beginnings of Telephony," Harper and Brothers, New York, 1929. 

 L. G. Abraham, "Circulating Currents and Singing on Two-Wire Cable Circuits," B.S.TJ., 



Vol. XIV, October 1935. 

 L. L. Bouton, "Four-Wire Circuits in Retrospect," Bell Lab. Record, December 1938. 

 S. G. Hale, "Splice Loading Developments," Bell Lab. Record, January 1951. 



