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

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              numbers on both ſides, which the annex­
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              ed Fractions being reduc'd to improper
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              Fractions of the ſame denomination, the
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              proportion appear'd to be (the denomi­
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              nators beng left out as equal on both ſides)
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              as 121 to 1665; or by reduction, as one
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              to (13 92/121). </s>
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              <s>Beſides this unuſual way of determi­
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              ning the gravity of ſome things, we mea­
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              ſur'd the proportion betwixt Quick-ſilver
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              and Water, by the help of ſo exact a bal­
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              lance, as looſes its
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              Æquilibrium
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              by the
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              hundredth part of a Grain. </s>
              <s>But becauſe
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              there is wont to be committed an over­
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              ſight in weighing Quick-ſilver and Wa­
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              ter, eſpecially if the Orifice of the Veſſel
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              wherein they are put be any thing wide, in
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              regard that men heed not that the ſurface
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              of Water in Veſſels will be concave,
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              but that of Quick-ſilver, notably convex
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              or protuberant: To avoid this uſual over­
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              ſight (I ſay) we made uſe of a glaſs bubble,
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              blown very thin at the Flame of a Lamp,
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              that it might not be too heavy for the
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              Ballance, and terminating in a very ſlender
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              neck, wherein the concavity or convexity
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              of a Liquor could not be conſiderable:
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              This Glaſs weighing 23 1/2 Grains, we fill'd </s>
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