...But if there is not room enough for the construction of a wall, makechannels with their vents extending to the open air...
Vitruvius 「Ten Books on Architecture」
...In this vessel are valves,accurately fitting over the upper vents of the pipes, which stop up theventholes, and keep what has been forced by pressure into the vesselfrom going down again...
Vitruvius 「Ten Books on Architecture」
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