Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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none of the Air been drawn away from a
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bout the Needle, which when the Load
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ſtone was removed, after ſome tremu
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lous Vibrations to and fro, reſted in a po
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ſition wherein it look'd North and
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Experi
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ment
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>PRoceed we now to the mention of
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that Experiment, whereof the ſatiſ
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factory tryal was the principal Fruit I
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promiſ'd my ſelf from our Engine. </
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being then ſufficiently known, that, in
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the Experiment
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De Vacuo,
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the Quick
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ſilver in the Tube is wont to remain ele
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vated, above the ſurface of that whereon
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it leans, about 27 digits: I conſidered,
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that, if the true and onely reaſon why the
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Quick-ſilver falls no lower, be, that at
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that Altitude, the Mercurial Cylinder in
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the Tube, is an
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Æquilibrium
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with the
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Cylinder of Air, ſuppoſ'd to reach from
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the adjacent Mercury to the top of the
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Atmoſphere: If this Experiment could
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be try'd out of the Atmoſphere, the
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Quick-ſilver in the Tube would fall
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down to a levell with that in the Veſſel,
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ſince then there would be no preſſure up
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on the Subjacent, to reſiſt the weight of </
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