Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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cend into it, namely, Whether they mount
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upwards by vertue of any ſuch
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poſitive le
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vity
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(as ſome Peripateticks ſpeak) ac
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quir'd together with their Aërial nature,
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as inables them to pierce through part of
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the Atmoſphere, and over-come its re
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ſiſtance. </
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>Or elſe, whether theſe ſteams
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being once raiſ'd above the Earth by their
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agitation, have their aſcent and ſuſtenta
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tion aloft, rather promoted then hindred
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by the Air: as the inferior parts of that,
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being thicker and heavier then the ſupe
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rior, the ſteams can more eaſily continue
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for a while their agitation upwards then
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downwards; And afterwards are by the
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ſame fluidity and thickneſs of the Air,
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carried to and fro in it, and kept from re
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lapſing to the Earth, as in the Sea water
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the ſaline parts are kept from ſubſiding by
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thoſe aqueous ones wherewith they are
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aſſociated. </
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Experi
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ment
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29</
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>We hop'd to illuſtrate this matter, by
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obſerving the motion of the ſmoke, pro
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ceeding from kindled or flaming Bodies in
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our exhauſted Receiver. </
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>But as we for
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merly noted, upon the exſuction of the
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Air, the ſmoking of thoſe Bodies pre
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ſently ceaſ'd. </
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>We had thoughts alſo of
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conveying into our Pneumatical Glaſs a </
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