1855 – vacuum tube

Heinrich Geissler and Julius Plucker use Geisslers new mercury vacuum pump to evacuate the atomosphere inside a glass tube. Plucker, a young professor at the University of Bonn, discovered that a glowing stream could be produced when electricity was passed through electrodes embedded in the glass tubes and that the stream responded to a magnet. Plucker called the tubes “Geissler tubes”.

Pluckers student, Johann Hittorf improved the design and noticed that the glowing stream grew brighter as the level of atomosphere in the glass tube diminished. He was also able to partially block the flow and observed shadows cast by the blockage.

3 Responses to “ 1855 – vacuum tube ”

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