There was a long silence while the corporal, sitting somewhere in the scooped-out heart of the rock of Gibraltar, watched a blue cathode tube.

He developed a version of the cathode tube and studied the penetration by X-rays of various materials.

In the 1930s indirectly heated cathode tubes became widespread in equipment using AC power.

The little gasoline engine whirred away, activating the cathode tube by providing electricity.

A message would flash on the cathode tube.

- Télélumières: The usual function of cathode tubes is reversed; blue light is emitted.

When the noble gases are used in cold cathode tubes to produce light, each of them has a different colour.

He swung around at the beep of an instrument; a small lighted dot was moving across the grid of a cathode tube.

Sister Catherine and her congregation became the dwindling white dot in the middle of a cathode tube.

The Coolidge tube, also called hot cathode tube, is the most widely used.