Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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reſted at about 29 Inches & an half above
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the ſurface of the Reſtagnant Quick-ſilver
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in the Veſſel, which did at firſt both amaze
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and perplex us, becauſe though we held it
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not improbable that the difference of the
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groſſer Engliſh Air, and that of
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Italy
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and
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France,
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might keep the Quick-ſilver from
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falling quite as low in this colder, as in
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thoſe warmer Climates; yet we could
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not believe that that difference in the Air
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ſhould alone be able to make ſo great a one
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in the heights of the Mercurial Cylinders;
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and accordingly upon enquiry we found,
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that though the various denſity of the
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Air be not to be over-look'd in this Ex
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periment, yet the main Reaſon why we
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found the Cylinder of Mercury to conſiſt
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of ſo many Inches, was this, That our
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Engliſh Inches are ſomewhat inferior in
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length to the digits made uſe of in Fo
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rein Parts, by the Writers of the Expe
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riment. </
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>The next thing I deſire Your Lordſhip to
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take notice of, is, That the heigth of the
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Mercurial Cylinder is not wont to be
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altogether ſo great as really it might
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prove, by reaſon of the negligence or in
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cogitancy of moſt that make the Experi
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ment. </
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<
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