Plücker tube

noun
Plück·​er tube | \ˈpli|kə(r)-, -lu̇|\

Definition of Plücker tube 

: a gas-filled discharge tube with a narrowly constricted straight portion in which the intensified luminosity adapts the tube to use in the spectroscopy of gases

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History and Etymology for Plücker tube

after Julius Plücker †1868 German mathematician and physicist

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