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

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    <archimedes>
      <text>
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            <p type="main">
              <s>
                <pb xlink:href="013/01/157.jpg" pagenum="127"/>
              we muſt anſwer, That of thoſe which are
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              eaſily intelligible without ocular demon­
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              ſtration, we can at preſent ſuggeſt upon
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              our own tryals no better then theſe. </s>
              <s>Firſt,
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              at the open end of the Tube the Glaſs
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              muſt not onely be made as even at the ed­
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              ges as you can, but it is very conveni­
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              ent (eſpecially if the Tube be large) that
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              the bottom be every way bent inwards,
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              that ſo the Orifice, not much exceeding a
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              quarter of an Inch in Diameter, may be
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              the more eaſily and exactly ſtopp'd by the
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              Experimenter's finger; between which
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              and the Quick-ſilver, that there may be
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              no Air intercepted (as very often it hap­
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              pens that there is) it is requiſite that the
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              Tube be fill'd as full as poſſibly it can be,
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              that the finger which is to ſtop it, preſſing
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              upon the accumulated and protuberant
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              Mercury, may rather throw down ſome,
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              then not finde enough exactly to keep out
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              the Air. </s>
              <s>It is alſo an uſeful and compen­
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              dious way not to fill the Tube at firſt
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              quite ful of Mercury, but to leave near the
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              top about a qnarter of an Inch empty; for
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              if you then ſtop the open end with your
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              finger, and invert the Tube that quarter
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              of an Inch of Air will aſcend in a great
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              bubble to the top, and in its paſſage thi-</s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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