... Due to the limitations of light microscopes, electron microscopes were developed. In the 1930s, biologists found that light microscopes had theoretical limits, and the scientific desires to see fine details of the interior structures of organic cells were increasing. The first type of electron microscope to be developed was the transmission electron microscope and includes a focused beam of electrons to see through the specimen. This type of electron microscope was developed by Max Knoll and Ernst Ruska in 1931. Around 1942, the first scanning electron microscope was used, and its development came from the electronics involved in scanning the beam of electrons across the specimen. Electron microscopes are sophisticated types of magnification devices used mostly in archaeology, medicine and geology to look at surfaces as well as layers of objects such as organs and rocks. Electron microscopes don't use light. Instead, they point a stream of electrons at ...

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