Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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>We might here take occaſion to ad
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mire, that though Water (as appear'd by
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the Experiment formerly mention'd of
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the Pewter Veſſel) ſeems not capable of
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any conſiderable condenſation, and ſeems
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not to have interſperſ'd in it any ſtore of
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Air; yet Quick-ſilver, of no greater bulk
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then Water, ſhould weigh near fourteen
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times as much. </
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>But having onely point
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ed at this as a thing worthy of conſidera
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tion, we will proceed in our inquiry after
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the heigth of the Atmoſphere: And to
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avoid the trouble of Fractions, we will
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aſſume that Quick-ſilver is fourteen times
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as heavy as Water, ſince it wants ſo little
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of being ſo. </
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>Wherefore having now given us the
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proportion of Air to Water, and Water
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to Quick-ſilver, it will be very eaſie to
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finde the proportion betwixt Air and
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Quick-ſilver, in caſe we will ſuppoſe the
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Atmoſphere to be uniformly of ſuch a
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conſiſtence as the Air we weighed here
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below. </
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>For ſince our Engine hath ſuffi
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ciently manifeſted that 'tis the
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Æquili
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brium
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with the external Air, that in the
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Torricellian
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Experiment keeps the Quick
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ſilver from ſubſiding; And ſince, by our
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accurate Experiment formerly mention'd, </
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