Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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For firſt we may know the capacity of the
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Receiver wherein the Experiment is
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made, ſince, by filling it with water, we
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may eaſily compute how many Quarts, or
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Meaſures of any other denomination, it
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contains of Air; which Air, when ſhut
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up in the Veſſel, may be ſuppoſ'd to have
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a preſſure equal to that of the Atmo
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ſphere; ſince it is able to keep the Quick
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ſilver in the Tube from falling any lower
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then it did in the free and open Air. </
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<
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here is given us the capacity of the braſs
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Cylinder empty'd by the drawing down
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of the Sucker (its bore and height being
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mention'd in the deſcription of our Pump)
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whereby we may come to know how
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much of the Air contain'd in the Recei
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ver is drawn out at the firſt ſuck. </
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<
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>And
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we may alſo eaſily define, either in weight
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or cubick meaſures the Cylinder of
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Quick-ſilver that anſwers to the Cy
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linder of Air lately mention'd (that
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Mercuriall Cylinder being in our En
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gine computable by deducting from
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the entire altitude or that Cylinder of
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Quick-ſilver, the altitude at which it reſts
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upon the firſt exſuction.) But though, if
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this Experiment were very watchfully
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try'd in Veſſels of ſeveral ſizes, and the </
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