Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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is almoſt empty, ſome of the ſubtler
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parts of the external Air may, by the
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preſſure of the Atmoſphere, be ſtrain'd
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through the very body of the
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Diachylon
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into the Receiver. </
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>But this is onely con
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jecture: </
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>Another Circumſtance of our Expe
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riment was this, That, if (when the
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Quick-ſilver in the Tube was fallen low)
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too much ingreſs were, at the hole of the
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Stop-cock, ſuddenly permitted to the ex
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ternal Air; it would ruſh in with that vio
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lence, and bear ſo forcibly upon the ſur
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face of the ſubjacent Quick-ſilver, that
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it would impel it up into the Tube rudely
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enough to endanger the breaking of the
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Glaſs. </
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<
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>We formerly mention'd, that the
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Quick-ſilver did not in its deſcent fall as
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much at a time after the two or three firſt
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exſuctions of the Air, as at the beginning:
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For, having mark'd its ſeveral Stages up
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on the Tube, we found, that at the firſt
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ſuck it deſcended an Inch and 3/8, and at the
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ſecond an Inch and 1/8; and when the Veſ
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ſel was almoſt empty'd, it would ſcarce at
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one exſuction be drawn down above the
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breadth of a Barly-corn. </
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<
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>And indeed we
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found it very difficult to meaſure in what </
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