plural of Hittorf tube

(historical) An early form of vacuum tube.

plural of Plücker tube

A vacuum tube, used in spectrum analysis, in which the part through which the discharge takes place is a capillary tube, thus producing intense incandescence of the contained gases. / A Crookes tube.

An improvement on the Crookes tube in which the electrons are produced by thermionic effect from a tungsten filament heated by an electric current.

plural of Coolidge tube

microcentrifuge tube

plural of Eppendorf tube

A tube that is entirely below the water level of a boiler during operation.

A single-ended thimble tube in a boiler, with an internal tube to encourage circulation.