Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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it ſelfe when repleniſhed with Air, full
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eleven graines. </
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<
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>That is, the Air contain
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able within the cavity of the
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Æolipile
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a
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mounted to eleven graines and ſomewhat
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more; I ſay ſomewhat more, becauſe of
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the particles of the Air, that were not
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driven by the fire out of the
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Æolipile.
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And by the way (if there be no miſtake
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in the obſervations of the diligent
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Mer
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ſennus
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) it may ſeeme ſtrange that it ſhould
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ſo much differ from 2. or 3. of ours; in
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none of which we could rarifie the Air in
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our Æ
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olipile
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(though made red hot almoſt
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all over, and ſo immediately plung'd into
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cold water) to halfe that degree which he
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mentions, namely to 70. times it's natu
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rall extent, unleſſe it were that the
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Æo
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lipile
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he imploy'd was able to ſuſtaine
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a more vehement heat then ours (which
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yet we kept in ſo great an one, that once
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the ſoder melting, it fell aſunder into the
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two Hemiſpheres it conſiſts of.) </
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<
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>The fore-mentioned way of weighing
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the Air by the help of an
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Æolipile,
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ſeems
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ſomewhat more exact then that which
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Merſennus
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uſed, In that in ours the
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Æoli
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pile
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was not weighed, till it was cold;
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whereas in his, being weighed red hot, it </
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