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. </
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>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. </
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>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 </
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