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="013/01/084.jpg" pagenum="44"/>
              leſs difficulty, then if the Cylinder, be­
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              ing devoid of Air, the Stop-cock were
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              exactly ſhut: We might take notice of
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              ſome other things, that depend upon the
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              Fabrick of our Engine it ſelf; but to ſhun
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              prolixity, we will, in this place, content
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              our ſelves to mention one of them, which
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              ſeems to be of greater moment then the
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              reſt, and it is this; that when the Sucker
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              has been impell'd to the top of the Cylin­
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              der, and the Valve is ſo carefully ſtopp'd,
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              that there is no Air left in the Cylinder a­
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              bove the Sucker: If then the Sucker be
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              drawn to the lower part of the Cylinder,
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              he that manages the Pump findes not any
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              ſenſibly greater difficulty to depreſs the
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              Sucker, when it is nearer the bottom of the
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              Cylinder, then when it is much further off.
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              </s>
              <s>Which circumſtance we therefore think fit
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              to take notice of, becauſe an eminent Mo­
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              dern Naturaliſt hath taught, that, when the
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              Air is ſucked out of a Body, the violence
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              wherewith it is wont to ruſh into it again,
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              as ſoon as it is allow'd to re-enter, pro­
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              ceeds mainly from this; That the preſſure
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              of the ambient Air is ſtrengthned upon
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              the acceſſion of the Air ſuck'd out; which,
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              to make it ſelf room, forces the neighbor­
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              ing Air to a violent-ſubingreſſion oſ its
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              parts: which, iſ it were true, he that draws </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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