Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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the writing of the laſt Experiment, at
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tempt to meaſure the preſſure of the At
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moſphere, but found it more difficult then
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we expected, to perform it with any ac
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curateneſs; for though by the help of the
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Manubrium
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the Sucker moved up and
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down with ſo much eaſe, that one would
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have thought that both its convex ſurface,
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and the concave one of the Cylinder were
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exquiſitely ſmooth, & as it were ſlippery;
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yet when the Sucker came to be moved
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onely with a dead weight or preſſure (that
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was not (like the force of him that
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pump'd) intended as occaſion required)
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we found that the little rufneſſes, or other
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inequalities, and perhaps too, the unequal
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preſſure of the Leather againſt the cavity
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of the Cylinder, were able now and then
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to put a ſtop to the deſcent or aſcent of
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the Sucker, though a very little external
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help would eaſily ſurmount that impedi
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ment; and then the Sucker would, for a
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while, continue its formerly interrupted
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motion, though that aſſiſtance were with
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drawn. </
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<
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>But this diſcouragement did not
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deterre us from proſecuting our Experi
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ment, and endeavoring, by a careful trial,
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to make it as inſtructive as we could.
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<
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>We found then that a Leaden Weight, </
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