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

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    <archimedes>
      <text>
        <body>
          <chap>
            <p type="main">
              <s>
                <pb xlink:href="013/01/190.jpg" pagenum="160"/>
              but for a great while we ſcarce ſaw one
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              bubble appear, onely when the Receiver
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              had been very much exhauſted, and the
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              Water was fallen very low, there appear'd
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              near the bottom of the Tube, certain
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              little bubbles, which ſeem'd to conſiſt of
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              ſuch parcels of Air as had not, by reaſon
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              of their ſmalneſs, got up to the top of
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              the Water, with the more bulkie and vi­
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              gorous ones. </s>
              <s>And that which is not in­
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              conſiderable, is, That having, by letting
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              in the Air, forc'd up the Water into the
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              Tube, we could not perceive that it aſ­
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              cended nearer the top, though we per­
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              mitted the Engine to remain unimploy'd
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              for two or three Nights together, and
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              watch'd whether the Water would ſwell
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              up and fill the Tube. </s>
              <s>And on this occa­
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              ſion I remember, that having try'd ſuch an
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              Experiment as this with Quick-ſilver in­
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              ſtead of Water, in a Tube of about a Foot
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              and a half long, wherein it might ſeem
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              more hopeful to eſcape bubbles; yet up­
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              on the drawing down the Quick-ſilver as
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              low as we could, and letting in the exter­
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              nal Air upon it, we found that ſome lurk­
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              ing particles of Air were got up to the top
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              of the Tube, and hinder'd the Quick­
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              ſilver from being forc'd up again ſo high. </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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