Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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(congruouſly to what hath been above
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recorded of the vaſt expanſion of the Air)
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the Water which in the heavier Viol ſuc
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ceeded in the room of thoſe forty odde, if
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not fifty great bubbles of Air, which at
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ſeveral times got out of it, amounted but
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to a very inconſiderable bigneſs. </
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>IT having been obſerv'd by thoſe that
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have conſider'd what belongs to
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Pendu
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lums
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(a Speculation that may, in my
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poor judgement, be highly uſeful to the
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Naturaliſts) that their Vibrations are
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more ſlowly made, and that their moti
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on laſts leſs in a thicker, then in a thinner
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Medium: We thought it not amiſs to
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try if a
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Pendulum
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would ſwing faſter, or
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continue ſwinging longer in our Receiver,
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in caſe of the exſuction of the Air, then
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otherwiſe. </
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>Wherefore we took a couple
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of round and poliſh'd
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Pendulums
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of Iron
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or Steel, of equal bigneſs, as near as we
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could get the Artificer to make them, and
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weighing each of them twenty Dragmes,
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wanting as many Grains. </
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>One of theſe
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we ſuſpended in the cavity of the Recei
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ver by a very ſlender ſilken ſtring, of a
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bout ſeven Inches and a half in length </
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