Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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151
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<
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>Now of this Experiment there are two
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or three Circumſtances yet to be men
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tion'd, which are no leſs then thoſe alrea
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dy recited, pertinent to our preſent pur
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poſe. </
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>In the firſt place then, when the great
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er part of the Air had been pump'd out of
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the Receiver, the riſing bubbles aſcend
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ed ſo very ſlowly in the Pipe, that their
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Progreſs was ſcarce diſcernable; which
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ſeem'd to proceed from this, That their
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bigneſs was ſuch, That they could not
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ſufficiently extend themſelves in the
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cavity of the Glaſs, without preſſing
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on both hands againſt the ſides of it,
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whereby they became of more difficult
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extruſion to the Water. </
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<
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>And though it
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may ſeem ſtrange theſe bubbles ſhould
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be of any conſiderable bulk, ſince 'tis
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like they conſiſted of leſſer parcels of
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the Air lurking in the Water, then thoſe
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that were vigorous enough to make their
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way through long before them: yet they
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were commonly much larger then before,
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ſome of them being equal in quantity to
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four or five Peas: Whether this their in
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creaſe of bulk proceeded from the greater
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decrement of the preſſure of the Air, </
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