The term electron microscope was first used in the paper written by Max Knoll of Berlin Institute of Technology and Ernst Ruska of High-Voltage Laboratory in 1932.
In the paper they developed the idea of electron lenses into a practical reality and demonstrated electron images taken by the instrument.
In 1933 they made a ‘super-microscope’ of the ten thousands magnifications, by a system of an electron lens composed of two magnets with two pairs of pole piece.
By 1939, the first commercial transmission electron microscope from Siemens Corporation, based on the improvements of Ruska’s work was introduced.
In 1942 and electrostatic type by Toshiba and a magnetic type by Hitachi were commercialized.
After the war, learning from the development in the USA, electron microscope were produced not only by Hitachi, Toshiba but also by Shimazu and Japan Electron Optical Laboratory and in 1955 exportation began.
The 1970s brought further improvement in all of t operational systems of the electron microscope and also saw the development of high voltage electron microscope, scanning transmission electron microscope and an industry wide standard of 0.344 nm resolution for transmission electron microscopes sold in later part of the decade.
History of electron microscope
