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Pneu-mat′ic Par′a-dox.

That peculiar exhibition of atmospheric pressure which retains a valve on its seat under a pressure of gas, only allowing a film of gas to escape. It is supposed to be owing to the thin film of escaping gas or vapor that passes out all round the disk, creating a partial vacuum, by which the disk is held on to its seat by the atmospheric pressure on the outside of the disk.

Pneumatic pile.

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