Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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134
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<
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>If Your Lordſhip ſhould now ask me
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what are the true cauſes of this varying al
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titude of the Mercurial Cylinder; I ſhould
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not undertake to anſwer ſo difficult a que
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ſtion, and ſhould venter to ſay no more,
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then that among divers poſſible cauſes to
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which it may be aſcribed, it would not be,
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perhaps, abſurd to reckon theſe that fol
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low. </
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<
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>Firſt then we may conſider, that the Air
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in the upper part of the Tube is much
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more rarified, and therefore more weak
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then the external Air, as may appear by
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this among other things, That upon the in
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clining of the Tube the Quick-ſilver will
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readily aſcend almoſt to the very top of
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it, and ſo take up eight or nine tenth parts,
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and perhaps more of that ſpace which it
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deſerted before: which would not happen
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if that whole ſpace had been full of unra
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rified Air, ſince that (as tryal may eaſily
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ſatisfie you) would not have ſuffer'd it
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ſelf to be thruſt into ſo narrow a room by
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ſo weak a preſſure. </
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<
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>So that although in
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our Tube when the included Air was
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heated, the Quick-ſilver was ſomewhat
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depreſſ'd: Yet there is this difference be
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twixt ſuch a Tube and common Weather
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Glaſſes, that in theſe the included and the </
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