Inventor, born in Igelshieb, EC Germany. He became a glass-blower and settled in Bonn in 1854, making scientific instruments. The Geissler tube, by which the passage of electricity through rarefied gases can be seen, and the Geissler mercury pump, are among his inventions.
Heinrich Geissler (May 26, 1814 - January 24, 1879) was a German physicist.
Geissler tubes
Educated by his father as a glassblower and gifted for the design and engineering, Geissler is most remembered for the invention of sealed glass tubes (called Geissler tubes) from which he demonstrated with Julius Plucker emission of a bluish glow by exciting the gas with an induction coil.
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