Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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it appears that a Cylinder of Mercury,
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able to ballance a Cylinder of the whole
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Atmoſphere, amounted to near about
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thirty Inches; and ſince, conſequently
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we may aſſume the proportion of Quick
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ſilver to Air to be as fourteen thouſand to
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one; it will follow, that a Cylinder of
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Air, capable to maintain an
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Æquilibrium,
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with a Mercurial Cylinder of two Foot
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and an half in height, muſt amount to
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35000 Feet of our Engliſh Meaſure;
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and conſequently (reckoning five Foot
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to a Geometrical Pace, and one thouſand
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ſuch Paces to a Mile) to ſeven full
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Miles. </
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>But this (as we lately intimated) pro
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ceeds upon the ſuppoſition, that the Air
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is every where of the ſame conſiſtence
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that we found it near the ſurface of the
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Earth; but that cannot with any ſafety
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be concluded, not onely for the reaſon I
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finde to have been taken notice of by the
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Antients, and thus expreſt in
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Seneca:
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Omnis Aër
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(ſays he)
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quo propior eſt terris
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hoc craſsior; quemadmodum in aqua & in
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omni humore fæx ima eſt, it a in Aëre ſpiſ
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ſißima quæ〈qué〉 deſidunt;
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but much more,
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becauſe the ſpringy Texture of the Aërial
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Corpuſcles, makes them capable of a </
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