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. </
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<
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>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. </
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>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. </
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>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. </
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<
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>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 </
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