Who invented dissecting microscope?

Electron microscope (electron microscope for short) is a microscope that displays the inside or surface of an object with electrons. According to the principle of electron optics, electron beam and electron lens are used instead of light beam and optical lens, so that the fine structure of matter can be imaged with very high magnification. 1926 Hans bush developed the first magnetoelectric lens. 193 1 year, Ernst ruska and Max Noel developed the first transmission electron microscope. This microscope is not a perspective sample, but a metal lattice. Luska 1986 won the Nobel Prize in Physics. 1938, he developed the first commercial electron microscope in Siemens. Osmic acid 1934 was proposed to enhance the contrast of the image. 1937 the first scanning transmission electron microscope was started. At the beginning, the main purpose of developing electron microscope was to show pathogens that could not be distinguished by optical microscope, such as viruses. After the appearance of projected metal sheet in 1949, people's interest in material science in electron microscope increased greatly. In the 1960 s, the accelerating voltage of transmission electron microscope was higher and higher to see through thicker and thicker substances. During this period, the electron microscope reached the ability to distinguish atoms. In the1980s, people were able to observe wet samples with scanning electron microscope. In the1990s, computers were increasingly used to analyze the images of electron microscopes. At the same time, more and more complicated lens systems could be controlled by computers, and the operation of electron microscopes became simpler and simpler.