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

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              of our Learned and Acurate Mathema­
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              ticians, thinking it enough for me to have
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              given the Hint already ſuggeſted. </s>
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              <s>For further confirmation of what hath
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              been delivered, we likewiſe tryed the Ex­
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              periment in a Tube of leſs then two foot
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              long: and, when there was ſo much Air
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              drawn out of the Veſſel, that the remain­
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              ing Air was not able to counterballance
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              the Mercurial Cylinder, the Quick-ſilver
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              in the Tube ſubſided ſo viſibly, that (the
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              Experiment being try'd in the little Veſ­
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              ſel lately mention'd) at the firſt ſuck it
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              fell above a ſpan, and was afterwards
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              drawn lower and lower for a little while;
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              and the external Air being let in upon it,
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              impell'd it up again almoſt to the top of
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              the Tube: So little matters it how heavy
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              or light the Cylinder of Quick ſilver to
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              ſubſide is, provided its gravity over­
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              power the preſſure of as much external
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              Air as bears upon the ſurface of that Mer­
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              cury into which it is to fall. </s>
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              <s>Laſtly we alſo obſerv'd, That if (when
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              the Mercury in the Tube had been drawn
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              down, and by an Ingreſs permitted to the
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              external Air, impell'd up again to its for­
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              mer height) there were ſome more Air
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              thruſt up by the help of the Pump into </s>
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