Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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<
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>This Notion may perhaps be ſome
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what further explain'd, by conceiving the
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Air near the Earth to be ſuch a heap of
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little Bodies, lying one upon another, as
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may be reſembled to a Fleece of Wooll.
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>For this (to omit other likeneſſes betwixt
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them) conſiſts of many ſlender and flexi
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ble Hairs; each of which, may indeed,
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like a little Spring, be eaſily bent or roul
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ed up; but will alſo, like a Spring, be
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ſtill endeavouring to ſtretch it ſelf out
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again. </
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>For though both theſe Haires,
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and the Aerial Corpuſcles to which we
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liken them, do eaſily yield to externall
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preſſures; yet each of them (by vertue of
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its ſtructure) is endow'd with a Power or
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Principle of ſelf-Dilatation; by vertue
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whereof, though the hairs may by a Mans
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hand be bent and crouded cloſer together,
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and into a narrower room then ſuits beſt
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with the nature of the Body: Yet whil'ſt
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the compreſſion laſts, there is in the fleece
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they compoſe an endeavour outwards,
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whereby it continually thruſts againſt the
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hand that oppoſes its Expanſion. </
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<
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>And
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upon the removall of the external preſ
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ſure, by opening the hand more or leſs, the
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compreſſed Wooll does, as it were, ſpon
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taneouſly expand or diſplay it ſelf towards </
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