Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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paſſing to the next, I ſhall leave it to your
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Lordſhip to conſider how far theſe tryals
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of ours will either confirm or disfavor
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the new Doctrine of ſeveral eminent Na
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turaliſts, who teach, That in all motion
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there is neceſſarily a Circle of Bodies, as
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they ſpeak, moving together; and whe
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ther the Circles in ſuch motion be an Ac
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cidental or Conſequential thing or no. </
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>TIs a known thing to thoſe that are con
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verſant in the Hydroſtaticks, That
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two Bodies which in the Air are of equal
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weight, but of unequal bulk, as Gold,
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for inſtance and Iron, being afterwards
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weighed in Water, will loſe their
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Æqui
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librium
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upon the change of the ambient
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Body, ſo that the Gold will ſink lower
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then the Iron; which, by reaſon of its
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greater bulk, has more Water to lift
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or diſplace, that it may ſink. </
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>By Analogy
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to this Experiment, it ſeem'd probable,
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that if two weights did in our Engine
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ballance each other, when the Glaſs was
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full of Air; upon the exſuction of a
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great part of that Air, ſo notable a change
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in the conſiſtence of the ambient Body, </
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