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). </
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>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. </
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>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 </
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