Concept

Heinrich Geißler

Summary
Johann Heinrich Wilhelm Geißler (26 May 1814 in Igelshieb – 24 January 1879) was a skilled glassblower and physicist, famous for his invention of the Geissler tube, made of glass and used as a low pressure gas-discharge tube. Geissler descended from a long line of craftsmen in the Thüringer Wald and in Bohemia. He found work in different German universities, eventually including the University of Bonn. There he was asked by physicist Julius Plücker to design an apparatus for evacuating a glass tube. Plücker owed his forthcoming success in the electric discharge experiments in large measure to his instrument maker, the skilled glassblower and mechanic Johann Heinrich Wilhelm Geissler. He learned the art of glassblowing in the duchy of Saxe-Meiningen.... He finally settled down as an instrument-maker in a workshop of his own at the University of Bonn in 1852. Geissler made a hand-crank mercury pump, and glass tubes that could contain a superior vacuum. The Geissler
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