The Bell System Technical Journal, Volume XIX, January 1940 delivers foundational insights into electrical communication engineering.
The Bell System Technical Journal is a quarterly AT&T publication that showcases research and development in the scientific and engineering aspects of electrical communication. This issue presents a range of studies and technical articles that guided early advances in radio, switching, filters, and telephony, reflecting the practical challenges and solutions of the time.
- The Physical Basis of Ferromagnetism by R. M. Bozorth
- Contact Phenomena in Telephone Switching Circuits by A. M. Curtis
- Effect of the Quadrature Component in Single Sideband Transmission by H. Nyquist and K. W. Pfleger
- Low Temperature Coefficient Quartz Crystals by W. P. Mason
- A New Standard Volume Indicator and Reference Level by H. A. Chinn, D. K. Gannett, and R. M. Morris
- Metallic Materials in the Telephone System by Earle E. Schumacher and W. C. Ellis
- The Coronaviser: An Instrument for Observing the Solar Corona in Full Sunlight by A. M. Skellett
- The Subjective Sharpness of Simulated Television Images by Millard W. Baldwin, Jr.
Ideal for engineers, researchers, and students seeking historical yet practical perspectives on early wireless and telephone technology.