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

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            <pb xlink:href="013/01/082.jpg" pagenum="42"/>
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              <s>WE will now proceed to obſerve that
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              though, by the help of the handle,
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              the Sucker be eaſily drawn down to the
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              bottom of the Cylinder; yet, without
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              the help of that Leaver, there would be
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              required to the ſame effect, a force or
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              weight great enough to ſurmount the
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              preſſure of the whole Atmoſphere: Since
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              otherwiſe the Air would not be driven out
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              of its place, when none is permitted to
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              ſucceed into the place deſerted by the
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              Sucker. </s>
              <s>This ſeems evident, from the
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              known
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              Torricellian
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              Experiment, in which,
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              if the inverted Tube of
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              Mercury
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              be but
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              25 Digits high, or ſomewhat more, the
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              Quick-ſilver will not fall but remain ſuſ­
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              pended in the Tube; becauſe it cannot
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              preſs the ſubjacent
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              Mercury
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              with ſo great
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              a force, as does the incumbent Cylinder
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              of the Air reaching thence to the top of
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              the Atmoſphere: Whereas, if the Cy­
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              linder of
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              Mercury
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              were three or four digits
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              longer, it would over-power that of the
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              external Air, and run out into the Veſſel'd
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                <emph type="italics"/>
              Mercury,
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              till the two Cylinders came to
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              an
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              Æquilibrium,
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              and no further. </s>
              <s>Hence
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              we need not wonder, that though the </s>
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