Johann Heinrich Wilhelm Geißler was a skilled glassblower and physicist, famous for his invention of the hand pumped Geissler mercury vacuum pump in the mid-1850's and in 1857, the Geissler tube, made of glass and used as a low pressure gas-discharge tube; these two inventions were critical technologies leading to the...
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![1862 Geißler discharge tube with holder in the Teylers Instrument Room. In 1856, his brother Wilhelm Geissler had worked together with Van der Willigen, the future (1864) conservator of the Physical Cabinet of Teylers Museum. After that, Heinrich Geissler made his well-known glass discharge tubes in Bonn.[1]](https://upload.wikimedia.org/wikipedia/commons/thumb/b/bf/Cabinet_V_-_Geissler_tubes_1862.jpg/1280px-Cabinet_V_-_Geissler_tubes_1862.jpg)
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Marian JaworskiAlso won honorary doctor of the University of Bonn
Klaus GrothAlso won honorary doctor of the University of Bonn
Robert LutherAlso won honorary doctor of the University of Bonn
Julius von SachsAlso won honorary doctor of the University of Bonn
Pope Shenouda III of AlexandriaAlso won honorary doctor of the University of BonnGerhard EbelingAlso won honorary doctor of the University of BonnAbout this person
Johann Heinrich Wilhelm Geißler was a skilled glassblower and physicist, famous for his invention of the hand pumped Geissler mercury vacuum pump in the mid-1850's and in 1857, the Geissler tube, made of glass and used as a low pressure gas-discharge tube; these two inventions were critical technologies leading to the discovery of the electron.
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