Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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proportion theſe decrements of the Mer
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curial Cylinder did proceed: partly be
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cauſe (as we have already intimated) the
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Quick ſilver was ſoon drawn below the
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top of the Receiver: and partly becauſe,
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upon its deſcent at each exſuction, it
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would immediatly reaſcend a little up
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wards; either by reaſon of the leaking of
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the Veſſel at ſome imperceptible hole or
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other, or by reaſon of the motion of
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Reſtitution in the Air, which, being ſome
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what compreſt by the fall as well as weight
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of the Quick ſilver, would repell it a lit
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tle upwards, and make it vibrate a little up
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and down, before they could reduce each
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other to ſuch an
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Æquilibrium
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as both
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might reſt in. </
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>But though we could not
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hitherto make obſervations accurate e
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nough concerning the meaſures of the
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Quick-ſilver's deſcent, to reduce them in
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to any
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Hypotheſis,
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yet would we not diſ
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courage any from attempting it: ſince, if it
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could be reduc'd to a certainty, tis proba
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ble that the diſcovery would not be un
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uſeful. </
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>And, to illuſtrate this matter a little
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more, we will adde, That we made a ſhift
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to try the Experiment in one of our above
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mention'd ſmall Receivers, not containing </
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