Boyle, Robert, New experiments physico-mechanicall, touching the spring of the air and its effects, 1660

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              <s>
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              ther things, invited us to conſider, whether
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              in the above-mention'd Experiment made
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              with the Bell and the Load-ſtone, there
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              might not in the deſerted part of the Tube
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              remain Air enough to produce a ſound:
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              ſince the Tubes for the Experiment
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              De
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              Vacuo
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              (not to mention the uſual thin­
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              neſs of the Glaſs) being ſeldom made
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              greater then is requiſite, a little Air might
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              bear a not inconſiderable proportion to
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              the deſerted ſpace. </s>
              <s>And that alſo, in the
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              Experiment
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              De Vacuo,
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              as it is wont to be
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              made, there is generally ſome little Air
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              that gets in from without, or at leaſt ſtore
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              of bubbles that ariſe from the Body of
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              the Quick-ſilver, or other Liquor it ſelf,
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              Obſervations heedfully made have fre­
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              quently informed us: And it may alſo
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              appear, by what has been formerly deli­
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              vered concerning the
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              Torricellian
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              Experi­
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              ment. </s>
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            <p type="margin">
              <s>
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              Experi­
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              ment
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              27.</s>
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              <s>On the occaſion of this Experiment
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              concerning ſounds, we may adde in this
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              place, That when we try'd the Experiment
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              formerly mention'd, of firing Gun-pow­
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              der with a Piſtol in our evacuated Recei­
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              ver, the noiſe made by the ſtriking of the
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              Flint againſt the Steel, was exceeding
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              languid in compariſon of what it would </s>
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          </chap>
        </body>
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