Boyle, Robert, New experiments physico-mechanicall, touching the spring of the air and its effects, 1660

Table of figures

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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. </s>
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              <s>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. </s>
              <s>For often times upon the opening </s>
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