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Related to Coolidge tube: Crookes tube
an x-ray tube, in which the cathode consists of a tungsten wire spiral surrounded by a focusing cup; the tungsten spiral is heated by an electric current; the quantity and quality of the x-rays so generated are regulated by varying the temperature of the cathode and the voltage between cathode and anode.
[William D. Coolidge, U.S. physicist and chemist, 1873–1975]
A kind of hot-cathode tube that is so highly exhausted that the residual gas plays no part in the production of the cathode stream, and that is regulated by variable heating of the cathode filament.
Coolidge,William D., U.S. physicist, 1873-1974.
Coolidge tube - a kind of x-ray tube.