An early experimental electrical discharge tube by means of which cathode rays and X-rays were discovered.

plural of tube top

(cycling) A tube in the bicycle frame that connects the bottom bracket shell to the head tube.

An early gas discharge tube used to demonstrate the principles of electrical glow discharge.

(sciences, engineering) A tube in the shape of a capital U, in certain applications having a semipermeable membrane in the middle.

A well in which a stainless steel tube is bored directly down into an aquifer

(physics) Any device in which a flow of electrons (or ions) through a gas acts as a source of light

The removable, light-emitting part of a fluorescent lamp

a type of butyrometer (used to estimate the proportion of butterfat in milk)

Alternative form of knob-and-tube