THE BELL SYSTEM 



TECHNICAL JOURNAL 



VOLUME XIX, 1940 



Table of Contents 

 January, 1940 



The Physical Basis of Ferromagnetism — R. M. Bozorth 1 



Contact Phenomena in Telephone Switching Circuits — 



A. M. Curtis 40 

 Effect of the Quadrature Component in Single Sideband Trans- 

 mission — H. Nyquist and K. W. Pfleger 63 



Low Temperature Coefficient Quartz Crystals — W. P. Mason. . . 74 

 A New Standard Volume Indicator and Reference Level — - 



H. A. Chinn, D. K. Gannett, and R. M. Morris 94 

 Metallic Materials in the Telephone System — 



Earle E. Schumacher arid W. C. Ellis 138 

 Technical Digest- — 



An Interesting Application of Electron Diffraction — 



L. H. Germer and K. H. Storks 152 



April, 1940 



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 Sunlight—^. 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 



3 



