Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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dily dilated it ſelf downward, from the
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Receiver into the Pump, when 'tis plain,
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that it is not the incumbent Atmoſphere,
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but onely the ſubjacent Air in the braſs
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Cylinder that has been remov'd: If this,
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I ſay, be objected, we may reply, That
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when a man ſqueezes a Fleece of Wool in
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his hand, he may feel that the Wool in
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ceſſantly bears againſt his hand, as that
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which hinders the hairs it conſiſts of, to
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recover their former and more natural ex
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>So each parcel of the Air about the
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Earth, does conſtantly endeavour to thruſt
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away all thoſe contiguous Bodies, whe
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ther Aërial or more groſs, that keep
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them bent, and hinder the expanſion of
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its parts, which will dilate themſelves or
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flie abroad towards that part, whether up
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wards or downwards, where they finde
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their attempted Dilatation of themſelves
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leſs reſiſted by the neihgboring Bodies.
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>Thus the Corpuſcles of that Air we have
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been all this while ſpeaking of, being un
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able, by reaſon of their weight, to aſcend
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above the Convexity of the Atmoſphere,
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and by reaſon of the reſiſtance of the ſur
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face of the Earth and Water, to fall down
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lower, they are forced, by their own gra
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vity and this reſiſtance, to expand and </
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