Tech History Today – April 20

In 1926 – Sam Warner approves the sound-on-disc system created by Western Electric and creates the Vitaphone company to develop the process to add sound to film.

In 1940 – Vladimir Zworykin and his team from RCA demonstrate the first electron microscope. It measured 10 feet high and weighed half a ton achieving a magnification of 100,000x.

In 1964 – The first AT&T picturephone transcontinental call was made between test displays at Disneyland and the New York World’s Fair.

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