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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              South. </s>
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              Experi­
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              ment
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              16</s>
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              <s>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. </s>
              <s>It
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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 </s>
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