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.
Like Tech History? Purchase Tom Merritt’s Chronology of Tech History at Merritt’s Books site.