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

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              <s>
                <pb xlink:href="013/01/083.jpg" pagenum="43"/>
              Sucker move eaſily enough up and down
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              in the Cylinder by the help of the
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              Manu­
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              brium;
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              yet if the
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              Manubrium
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              be taken off,
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              it will require & conſiderable ſtrength to
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              move it either way. </s>
              <s>Nor will it ſeem
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              ſtrange, that if, when the Valve and
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              Stop-cock are well ſhut, you draw down
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              the Sucker, and then let go the
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              Manubri­
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              um;
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              the Sucker will, as it were of it ſelf,
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              re-aſcend to the top of the Cylinder, ſince
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              the ſpring of the external Air findes no­
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              thing to reſiſt its preſſing up the Sucker.
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              </s>
              <s>And for the ſame reaſon, when the Re­
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              ceiver is almoſt evacuated, though, ha­
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              ving drawn down the Sucker, you open
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              the way from the Receiver to the Cylin­
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              der, and then intercept that way again by
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              returning the Key; the Sucker will, up­
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              on the letting go the
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              Manubrium,
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              be
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              forcibly carried up almoſt to the top of
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              the Cylinder: Becauſe the Air within the
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              Cylinder, being equally dilated and weak­
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              ned with that of the Glaſs, is unable to
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              withſtand the preſſure of the external Air,
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              till it be driven into ſo little ſpace, that
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              there is an
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              Æquilibrium
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              betwixt its force
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              and that of the Air without. </s>
              <s>And con­
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              gruouſly hereunto we finde, that in this
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              caſe, the Sucker is drawn down with little </s>
            </p>
          </chap>
        </body>
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