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 the first practical application of an electron microscope. This early model was 10 feet high and weighed half a ton. That thing was huge, especially considering it was meant to magnify really tiny things!
Vladimir Zworykin is also famous for being one of the inventors of the television.