Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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<
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>As much of the event as concerns our
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preſent purpoſe, was this, That till a con
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ſiderable part of the Air was drawn out
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of the Receiver, the Tube continu'd top
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full of Water as when it was put in, it be
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ing requiſite that a great part of the Air
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formerly contain'd in the Receiver, ſhould
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be drawn out, to bring the remaining
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Air to an
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Æquilibrium
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with ſo ſhort and
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light a Cylinder of Water. </
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>But when
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once the Water began to fall in the Tube,
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then each exſuction of Air made it de
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ſcend a little lower, though nothing near
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ſo much as the Quick-ſilver at the begin
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ning did in the Experiment formerly men
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tion'd. </
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>Nor did there appear ſo much
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inequality in the ſpaces tranſmitted by
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the Water in its deſcent, as there did in
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thoſe obſerv'd in the fall of the Quick
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ſilver, of which the cauſe will ſcarce ſeem
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abſtruſe to him that ſhall duly reflect up
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on what has been already deliver'd. </
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<
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>And
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whereas we drew down the Quick-ſilver
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in the Tube ſo far as to bring it within an
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Inch of the ſurface of the other Quick
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ſilver into which it was to fall; the loweſt
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we were able to draw down the Water
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was, by our conjecture, to about a Foot </
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