Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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from pumping) by the bare application
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of a hand moderately warm to the deſert
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ed part of the Tube, the remaining Wa
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ter would be ſpeedily and notably de
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preſſ'd. </
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>And having for a while held a
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kindled Coal to the outſide of the Tube,
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(the Pump being ſtill unimploy'd, becauſe
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the Veſſel chanced to hold extraordinarily
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well) the Air was by the heat ſo far ex
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panded, that it quickly drave the Water
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to the bottom of the Tube, which was
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divers Inches beneath the ſurface of the
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ambient Water. </
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>Whereby it appears (by
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the ſame way by which we formerly mea
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ſur'd the dilatation of the Air) that the
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Air, even when it is expanded to between
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90 and 100 times, its extent will yet rea
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dily admit of a much further rarifaction
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by heat. </
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>I conſider'd alſo that in caſe the Bub
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bles we have been ſpeaking of, were pro
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duc'd by the parcels of Air latitant in the
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Water, that Air being now got together
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to the top of the Tube, though the Air
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were again drawn out of the Receiver,
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the taking off its preſſure would not diſ
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cloſe bubbles as before; and accordingly,
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the Air being again pump'd out, the Wa
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ter in the Tube deſcended as formerly: </
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