Boyle, Robert, New experiments physico-mechanicall, touching the spring of the air and its effects, 1660

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              <s>
                <pb xlink:href="013/01/268.jpg" pagenum="238"/>
              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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                <emph type="italics"/>
              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. </s>
              <s>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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              </s>
              <s>We found then that a Leaden Weight, </s>
            </p>
          </chap>
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