Demonstration of First Practical Electron Microscope (opens in new tab)

April 20, 1940 Vladimir Zworykin, research director at RCA, holds a public demonstration of the first practical electron microscope. While the electron microscope had originally been invented in 1931, the first model was only able to produce a magnification of 400X. RCA’s model was the first to create a magnification of 100,000X, which was truly… Demonstration of First Practical Electron Microscope is original content of This Day in Tech History.