Radio Develpoment

Eugene Goldstein developed cathode rays in 1876.

Sheldon Bidwell developed the telephography in 1880.

Paul Nipkow develpoed the electric telescope in 1881

The interdiction of vacum-tube amplification for telephone line allowed AT&T to experiment with sending speeches to distant audiences that listened over loud speakers. The next step would be to use the lines to radio stations, and in December 1921 a memo written by two AT&T engineers, J.F.Brantley and H.C.Lavender  back outline the establishment of a national radio one work, financially supported by advertising.

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