...Valves are inserted in the cylinders, beneath thelower vents of the pipes, and over the openings which are in the bottomsof the cylinders...
Vitruvius 「Ten Books on Architecture」
...As he fervently hoped, jets of live steamrushed through these vents with terrible force and bathed the head ofthe stairs with a scalding, blinding vapor...
Various 「Astounding Stories, March, 1931」
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