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The Cemented Bladder

Tie the neck of the bladder to a stop-cock, which is to be screwed to
the plate of the pump, and the air exhausted from the bladder; then
turn the stop-cock, to prevent the re-entrance of the air, and unscrew
the whole from the pump. The bladder will be transformed into two flat
skins, so closely applied together, that the strongest man cannot
raise them half an inch from each other; for an ordinary-sized
bladder, of six inches across the widest part, will have one side
pressed upon the other with a force equal to 396 pounds' weight.

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