Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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leſs difficulty, then if the Cylinder, be
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ing devoid of Air, the Stop-cock were
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exactly ſhut: We might take notice of
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ſome other things, that depend upon the
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Fabrick of our Engine it ſelf; but to ſhun
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prolixity, we will, in this place, content
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our ſelves to mention one of them, which
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ſeems to be of greater moment then the
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reſt, and it is this; that when the Sucker
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has been impell'd to the top of the Cylin
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der, and the Valve is ſo carefully ſtopp'd,
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that there is no Air left in the Cylinder a
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bove the Sucker: If then the Sucker be
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drawn to the lower part of the Cylinder,
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he that manages the Pump findes not any
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ſenſibly greater difficulty to depreſs the
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Sucker, when it is nearer the bottom of the
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Cylinder, then when it is much further off.
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>Which circumſtance we therefore think fit
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to take notice of, becauſe an eminent Mo
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dern Naturaliſt hath taught, that, when the
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Air is ſucked out of a Body, the violence
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wherewith it is wont to ruſh into it again,
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as ſoon as it is allow'd to re-enter, pro
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ceeds mainly from this; That the preſſure
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of the ambient Air is ſtrengthned upon
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the acceſſion of the Air ſuck'd out; which,
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to make it ſelf room, forces the neighbor
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ing Air to a violent-ſubingreſſion oſ its
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parts: which, iſ it were true, he that draws </
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