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Mechanical Television

CRT Receivers for Mechanical Transmissions

As early as the late 20s, experimentation was going on with the use of cathode ray tubes to display television images. Philo Farnsworth displayed a crude image in 1927, and Max Dieckerman did the same in 1928. By 1929 Vladimir Zwoykin, then with Westinghouse, was experimenting with CRT receivers. In the early 30s there were many CRT receiver designs:

Article by Jeff Lendaro about the Zworykin 1928 CRT receiver Television wilth a Cathode Ray Tube - 1929
Harry Lubke, W6XAO Purdue University
F. Kerkhof RCA CRT receiver for 120 line experiments
Ediswan design - 1934 Television Manufacturing Co.

Popular Radio, May 1928

1931 Circuit diagram of a CRT receiver

Popular Science, March 1932