VOLUME XK APRIL, 1940 



NUMBER 2 



THE BELL SYSTEM 



TECHMCAL JOURNAL 



DEVOTED TO THE SCIENTIFIC AND ENGINEERING ASPECTS 

 OF ELECTRICAL COMMUNICATION 



Advances in Carrier Telegraph Transmission — A. L. Matte . 161 



Electrical Drying of Telephone Cable — L, G. Wade .... 209 



Electrical Wave Filters Employing Crystals with Normal and 

 Divided Electrodes — W. P. Mason and R. A. Sykes . . 221 



The Coronaviser, an Instrument for Observing the Solar Corona 

 in Full SunUght— ^. M, Skellett 249 



Lead-Tin-Arsenic Wiping Solder — Earle E. Schumacher and 



G. S. Phipps 262 



Nuclear Fission — Karl K, Darrow 267 



A Solution for Faults at Two Locations in Three-Phase Power 

 Systems — E. F. Vaage 290 



A Single Sideband Musa Receiving System for Commercial 

 Operation on Transatlantic Radio Telephone Circuits 



—F, A. Polkinghorn 306 



Abstracts of Technical Papers 336 



Contributors to this Issue 338 



AMERICAN TELEPHONE AND TELEGRAPH COMPANY 



NEW YORK 



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