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. </s>
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              <s>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. </s>
              <s>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, </s>
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