A CARRIER TELEPHONE SYSTEM FOR TOLL CABLES 105 



7. "Electrical Wave Filters Employing Quartz Crystals as Elements" by W. P. 



Mason, Bell Sys. Tech Jour., Vol. XIII, p. 405, July 1934. 



8. "Magnetic Generation of a Group of Harmonics" by E. Peterson, J. M. Manley 



and L. R. Wrathail, Electrical Engineering, Vol. 56, No. 8, p. 995, August 1937; 

 also Bell Sys. Tech. Jour., October 1937. 



9. "Wide-Band Transmission in Sheathed Conductors" by O. B. Blackwell, Bell 



Telephone Quarterly, Vol. XIV, p. 145, July 1935. 



10. "Systems for Wide-Band Transmission Over Coaxial Lines" by L. Espenschied 



and M. E. Striebv, Electrical Engineering, Vol. 53, pp. 1371-1380, October 

 1934; also Bell Sys. Tech. Jour., Vol. XIII, pp. 654-679, October 1934. 



11. "Modern Systems of Multi-Channel Telephony on Cables" by A. S. Angwin 



and R. A. Mack, Journal of the Inst, of Electrical Engineers, Vol. 81, No. 941, 

 p. 573, November 1937. 



