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