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

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              egreſs at the Stop-cock to as much of the
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              external Air as would come in, the Quick­
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              ſilver was impell'd up almoſt to its firſt
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              height: I ſay almoſt, becauſe it ſtopt
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              near a quarter of an Inch beneath the Pa­
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              per mark formerly mention'd; which we
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              aſcrib'd to this, That there was (as is u­
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              ſual in this Experiment) ſome little Parti­
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              cles of Air engag'd among thoſe of the
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              Quick-ſilver; which Particles, upon the
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              deſcent of the Quick-ſilver, did manifeſt­
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              ly riſe up in Bubbles towards the top of
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              the Tube, and by their preſſure, as well
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              as by leſſening the Cylinder by as much
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              room as they formerly took up in it, hin­
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              der'd the Quick-ſilver from regaining its
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              firſt height. </s>
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              <s>This Experiment was a few days after
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              repeated in the preſence of thoſe excellent
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              and deſervedly Famous Mathematick
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              Profeſſors, Dr.
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              Wallis,
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              Dr.
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              Ward,
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              and Mr.
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                <emph type="italics"/>
              Wren,
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              who were pleaſed to Honor it with
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              their Preſence: And whom I name, both
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              as juſtly counting it an Honor to be
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              known to them, and as being glad of ſuch
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              Judicious and illuſtrious Witneſſes of our
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              Experiment; and 'twas by their gueſs that
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              the top of the Quick-ſilver in the Tube
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              was defin'd to be brought within an Inch </s>
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