Lee de Forest’s Sale of Audion Rights to AT&T and Its Importance for the Development of Radio Technics

The preparation and holding of the presentation Lee de Forest’s audion, which contributed to sale his patent rights AT&T, is considered. role J. Carty John S. Stone in was noted. Harold D. Arnold’s experiments with audion Hendrik van der Bijl’s theory set stage for industrial production vacuum triodes telephone repeaters. It shown that a thermionic three-electrode tube has made it possible develop innovative commercial repeaters achieve progress long-distance telephony.