The central tube evidently held a vast number of fusion devices.

The reaction mass can be lowered through the central tube when we're boosting.

A central tube pierced through an almost globular centre section.

Lieutenant Mills was proposing to use the central tubes on each side.

Through the center of the earth, from pole to pole, extends a central tube.

Were all those people really walking into the tunnel's central tube?

Dathka indicated the central tube going down into the darkness.

The central supporting tube was split up in front, making place for attachment of the engine and gearbox.

The reflected light focused at the central tube is 71 to 80 times more intense than the ordinary sunlight.

"Do you think you can shrink on the jackets, and rifle the central tube?"