Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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but for a great while we ſcarce ſaw one
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bubble appear, onely when the Receiver
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had been very much exhauſted, and the
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Water was fallen very low, there appear'd
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near the bottom of the Tube, certain
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little bubbles, which ſeem'd to conſiſt of
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ſuch parcels of Air as had not, by reaſon
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of their ſmalneſs, got up to the top of
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the Water, with the more bulkie and vi
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gorous ones. </
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>And that which is not in
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conſiderable, is, That having, by letting
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in the Air, forc'd up the Water into the
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Tube, we could not perceive that it aſ
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cended nearer the top, though we per
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mitted the Engine to remain unimploy'd
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for two or three Nights together, and
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watch'd whether the Water would ſwell
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up and fill the Tube. </
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>And on this occa
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ſion I remember, that having try'd ſuch an
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Experiment as this with Quick-ſilver in
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ſtead of Water, in a Tube of about a Foot
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and a half long, wherein it might ſeem
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more hopeful to eſcape bubbles; yet up
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on the drawing down the Quick-ſilver as
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low as we could, and letting in the exter
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nal Air upon it, we found that ſome lurk
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ing particles of Air were got up to the top
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of the Tube, and hinder'd the Quick
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ſilver from being forc'd up again ſo high. </
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