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

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              of the ſurface of that in the Veſſel. </s>
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              <s>And here, for the Illuſtration of the
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              foregoing Experiment, it will not be a­
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              miſs to mention ſome other particulars
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              relating to it. </s>
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              <s>Firſt then, When we endeavor'd to
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              make the Experiment with the Tube
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              cloſ'd at one end with
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              Diachylon
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              inſtead
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              of an Hermetical Seal; we perceiv'd, that
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              upon the drawing of ſome of the Air out
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              of the Receiver, the Mercury did indeed
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              begin to fall, but continu'd afterwards to
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              ſubſide, though we did not continue pum­
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              ping. </s>
              <s>Whence it appear'd, that though
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              the
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              Diachylon
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              that ſtopt the end of the
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              Tube were ſo thick and ſtrong, that the
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              external Air could not preſs it in (as expe­
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              rience taught us that it would have done,
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              if there had been but little of it) yet the
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              ſubt'ler parts of it were able (though
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              ſlowly) to inſinuate themſelves through
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              the very body of the Plaiſter, which it
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              ſeems was of ſo cloſe a Texture, as that
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              which we mention'd our ſelves to have
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              ſucceſsfully made uſe of in the Experi­
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              ment
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              De Vacuo
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              ſome years ago. </s>
              <s>So that
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              now we begin to ſuſpect, that perhaps one
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              Reaſon, why we cannot perfectly pump
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              out the Air, may be, that when the Veſſel </s>
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