Boyle, Robert, New experiments physico-mechanicall, touching the spring of the air and its effects, 1660

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              would imagine, to drive out all the Air
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              from a large
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              Æolipile,
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              I eaſily ſuſpected
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              that the diſtenſion of the Bladder in our
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              pneumatical Veſſel, might proceed not
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              from the Watery ſteams that came out at
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              the narrow mouth of the
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              Æolipile,
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              and
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              had very much wetted the Bladder, but
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              from the rarified Air which in that ſort of
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              Veſſels is wont for a good while together
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              to come out with the rarified Water: and
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              accordingly having reiterated the Experi­
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              ment I found it very difficult (by rea­
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              ſon of the ſhrinking of the Bladders (up­
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              on their being heated) and of other impe­
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              diments) to make it ſo accurately as to de­
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              duce from it, that Water may be rarified
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              into true Air. </s>
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              Natural &
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              Hiſt.
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              In­
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              ,
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              Lib. 3.
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              9.</s>
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              Geogr. </s>
              <s>Ge­
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              ral.
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              <s> Lib.
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              19.</s>
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              <s>Againſt the four other above-mention'd
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              Conſiderations, we cannot ſpend time to
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              frame Objections, but muſt forth with
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              proceed to the mention of thoſe things
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              that ſeem to argue that Air (at leaſt ſuch
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              as produc'd our bubbles) maybe gene­
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              rated of Water and other Bodies. </s>
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              <s>Firſt then we have found by Experi­
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              ence that a vapid Air, or Water rarified
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              into vapor, may at leaſt for a while emu­
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              late the elaſtical power of that which is
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              generally acknowledg'd to be true Air. </s>
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