MUTUAL t.\IU\ r.lSili IX ir.llF. ril.TF.KS 111 



7. \'.in ilcr BijI, H. T., "Tlicrmioiiic \'.u iiuiii I'ulics," Piil>lishc<l 1020. 

 M. I'icrce. O. \V., "KIcctrir (IstiJI.itioMs .iiul Klectric Waves," I'liblislicd, 1920. 

 •». Colpitts, K. H. and Ul.ickwcll. (). B.. "Carrior Current Telephony and TcIcr- 

 rapfiy." 7><i»ij. .1. /. li. E.. l"el>.. l'>21. 



10. Clement, I.. M., Rvan, V. M., and Martin, I). K., "The .Xvaion-I.o.s .AnRcles 

 Radio Toll Circuit/' Prot. I. K. E.. May, l'J21. 



11. Kletrher, H., "The Nature of Speech and Its Interpretation," Jour. Franklin 

 Inst.. June, 1922. 



12. Canipbell, C.. .\., "Physical Theory of the Electric Wave-Filter," Bell Sys. Tech. 



Jour.. Nov., \<iU. 



1.1. Zol>el, O. J., "Theory and Design of Uniform and Composite Electric Wave- 

 Filters," Bell Sys. Tech. Jour.. Jan., 1923. 



14 Rose, .-X. F., "Practical Application of Carrier Telephone and Telegraph in the 

 Bell System," Bell Sys. Tech. Jour.. April, 1923. 



15. Hartley, R. V. L., "Relation of Carrier and Side-Bands in Radio Transmission," 

 Bell Sys. Tech. Jour., April, 1923. 



It). Bown, C. D., Englund, C. R., and Friis, H. T., "Radio Transmission Measure- 

 ments," Proc. I. R. E.. April, 1923. 



17. Peters. L. J., "Theory of Electric Wave Filters Built up of Coupled Circuit 

 Elements," Jour. A. I. E. £., May, 1923. 



18. Demarest, C. S., "Telephone Equipment for Long Cable Circuits," Bell Sys. 

 Tech. Jour.. July, 1923. 



19. Nichols, H. W. and Espcnschied, L., " Radio E.\tension of the Telephone 

 System to Ships at Sea," Bell Sys. Tech. Jour., July, 1923. 



2(1. Carson, J. R. and Zobel, O. J., "Transient Oscillations in Electric Wave- 

 Filters," BeU Sys. Tech. Jour.. July, 1923. 



21. Arnold, H. D. and Espenschied, L., "Transatlantic Radio Telephonv," Belt 

 Sys. Tech. Jour., Oct., 1923. 



12. Best, F. II., "Measuring Methods for Maintaining the Transmission Efficiency 

 of Telephone Circuits," Jour. A. I. E. £., Feb., 1924. 



2i. Casjicr, W. L., "Telephone Transformers," Jour. A. I. Er-E.. March, 1924. 



24. Slaughter, N. H. and Wolfe, W. V., "Carrier Telephony on Power Lines," 

 Jour. A. I. E .£., April, 1924. 



25. Foster, R. M., "A Reactance Theorem," Bell Sys. Tech. Jour., .\pril, 1924. 



26. .Martin, W. H., "The Transmission Unit and Telephone Transmission Refer- 

 ence System," Bell Sys. Tech. Jour.. July, 1924. 



27. Zobel, O. J., "Transmission Characteristics of Electric Wave-Filters," Bell 

 Sys. Tech. Jour., Oct., 1924. 



