Today in Tech History – April 20, 2016

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

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

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

Like Tech History? Get the illustrated Year in Tech History at Merritt’s Books site.