Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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was employ'd, the Bladder ſeem'd again
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a little to preponderate. </
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>Afterwards
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the Air in the Glaſs being begun to be
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drawn out, the Biadder began (according
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to the formerly mention'd Obſervations)
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to expand it ſelf, and manifeſtly to out
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weigh the oppoſite weight, drawing
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down the Scale to which it was faſtned
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very much beneath the other, eſpecially
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when the Air had ſwell'd it to its full ex
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tent. </
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>This done, we very leiſurely let in the
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external Air; and obſerv'd, that upon
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the flagging of the Bladder, the Scale
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whereto it was faſtned, not onely by de
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grees return'd to an
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Æquilibrium
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with the
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other, but at length was a little out
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weighed by it. </
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>But becauſe we ſuſpected there
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might have interven'd ſome unheeded
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Circumſtance in this laſt part of the Ex
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periment, we would not preſently take
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out the Scales, nor meddle with the Co
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ver, but leaving things as they were, we
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perceiv'd, that after a little while the
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Bladder began again to preponderate, and
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by degrees to ſink lower and lower for
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divers hours; wherefore, leaving the
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Veſſel cloſ'd up all night, we repair'd to it </
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