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Heinrich Geissler
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Heinrich Geissler

German glassblower
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Also known as: Johann Heinrich Wilhelm Geissler
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Article History
Quick Facts
In full:
Johann Heinrich Wilhelm Geissler
Born:
May 26, 1815, Igelshieb, Thuringia, Saxe-Meiningen [Germany]
Died:
January 24, 1879, Bonn, Prussia [Germany] (aged 63)
Also Known As:
Johann Heinrich Wilhelm Geissler

Heinrich Geissler (born May 26, 1815, Igelshieb, Thuringia, Saxe-Meiningen [Germany]—died January 24, 1879, Bonn, Prussia [Germany]) was a German glassblower for whom the Geissler (mercury) pump and the Geissler tube are named.

Geissler opened a shop in Bonn in 1854 to make scientific apparatus and devised his mercury air pump in 1855. Later, using an apparatus of his own invention, he was able to demonstrate, in collaboration with Julius Plücker, that water reaches its maximum density at 3.8 °C (later determined to be 3.98 °). Among his other inventions were the vaporimeter and the Geissler tube, in which an electric current produces light when passed through a rarefied gas.

This article was most recently revised and updated by Encyclopaedia Britannica.