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="013/01/161.jpg" pagenum="131"/>
              the heat or cold that affected the ambient
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              Air. </s>
              <s>But that which I was chiefly careful
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              to obſerve, was this, That oftentimes the
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              Quick-ſilver did riſe and fall in the Tube,
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              and that very notably, without conforming
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              it ſelf to what is uſual in Weather-glaſſes,
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              whoſe Air is at the top, nay quite contrary
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              thereunto: for ſometimes I obſerv'd it in
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              very cold weather (ſuch as this Winter has
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              already afforded us good ſtore of) to fall
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              down much lower then at other times,
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              when by reaſon of the abſence of both
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              Froſt, Snow, and ſharp Winds, the Air was
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              comparatively much warmer. </s>
              <s>And I fur­
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              ther obſerv'd, That ſometimes the Quick­
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              ſilver would for ſome days together reſt
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              almoſt at the ſame height; and at other
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              times again it would in the compaſs of the
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              ſame day conſiderably vary its altitude,
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              though there appear'd no change either in
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              the Air abroad, or in the temper of the Air
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              within the Room (wherein was conſtantly
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              kept a good Fire) nor in any thing elſe, to
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              which either I, or ſome eminently Learned
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              Men whom I then acquainted with the
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              Experiment, could reaſonably impute
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              ſuch a change: Eſpecially conſidering that
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              the ſpace wherein the Mercury wandred up
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              and down, within about five Weeks, a­
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              mounted to full two Inches, of which we </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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