a luminous region between the Aston dark space and the Crookes dark space in a vacuum tube, occurring when the pressure is low.


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    a flow of electrons emanating from a cathode in a vacuum tube and focused into a narrow beam. Historical Examples A cathode-ray photograph of the whale, showing myself, the original Jonah, seated inside. The Enchanted Typewriter John Kendrick Bangs cathode ray cath·ode ray (kāth’ōd’) n. A stream of electrons emitted by the cathode in electrical […]

  • Cathode-ray tube

    a vacuum tube generating a focused beam of electrons that can be deflected by electric fields, magnetic fields, or both. The terminus of the beam is visible as a spot or line of luminescence caused by its impinging on a sensitized screen at one end of the tube. Cathode-ray tubes are used to study the […]

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    protection of ferrous metals against electrolysis by the attachment of sacrificial anodes. noun (metallurgy) a technique for protecting metal structures, such as steel ships and pipelines, from electrolytic corrosion by making the structure the cathode in a cell, either by applying an electromotive force directly or by putting it into contact with a more electropositive […]

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    pertaining to a cathode or phenomena in its vicinity.

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