Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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their way upwards. </
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>This, I ſay, is of
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no great importance to our preſent Diſ
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courſe, ſince either way the Terreſtrial
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Steam may here and there conſiderably
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alter the gravity or preſſure of the At
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moſphere. </
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>Your Lordſhip may alſo be pleaſed to
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remember, That by our ſeventeenth Ex
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periment it appear'd that as when the Air
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in the Receiver was expanded more then
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ordinarily, the Quick-ſilver in the Tube
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did proportionably ſubſide; ſo when the
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Air in the ſame Receiver was a little more
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then ordinarily compreſſ'd, it did impell
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up the Quick-ſilver in the Tube above
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the wonted height of betwixt ſix and ſe
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ven and twenty digits. </
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>And if to theſe things we annex, that
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for ought we can finde by tryals purpoſe
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ly made, the degree of rarity or denſity
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of the Air, ſhut up into our Receiver, does
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not ſenſibly alter its temperature as to
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cold or heat. </
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>It will not, I hope, appear
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abſurd to conceive, That ſince the Air,
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included in the Tube, could but very faint
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ly hinder the aſcent of the Quick-ſilver,
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or preſs it downwards, ſince too that inclu
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ded Air could ſcarce immediately receive
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any ſenſible alteration, ſave either by heat </
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