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

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              <s>
                <pb xlink:href="013/01/145.jpg" pagenum="115"/>
              a Quart; but that (agreeably to what we
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              formerly obſerved) we found it as difficult
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              to bring this to be quite empty as to eva­
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              cuate the greater; the leaſt external Air
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              that could get in (and we could not poſſi­
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              bly keep it all perfectly out) ſufficing in ſo
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              ſmall a Veſſel to diſplay a conſiderable
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              preſſure upon the ſurface of the Mercury,
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              and thereby hinder that in the Tube from
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              falling to a level with it. </s>
              <s>But this is remark­
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              able, that having two or three times try'd
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              the Experiment in that ſmall Veſſel, upon
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              the very firſt Cylinder of Air that was
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              drawn out of the Receiver, the Mercury
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              fell in the Tube 18 Inches and a half, and
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              at another 19 Inches and a half. </s>
            </p>
            <p type="main">
              <s>But, on this occaſion, I hold it not un­
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              fit to give Your Lordſhip notice that I
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              hop'd, from the deſcent of the Quick­
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              ſilver in the Tube upon the firſt ſuck, to
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              derive this advantage: that I ſhould thence
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              be enabled to give a near gueſs at the pro­
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              portion of force betwixt the preſſure of
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              the Air (according to its various ſtates, as
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              to Denſity and Rarefaction) and the gra­
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              vity of Quick-ſilver, then hitherto has
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              been done. </s>
              <s>For in our Experiment there
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              are diverſe things given, that may be
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              made uſe of towards ſuch a diſcovery. </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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