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

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              other pneumatical Engines wherein the
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              Air has been compreſſ'd, and its Springs
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              violently bent by an apparent externall
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              force; upon the removall of which, 'tis
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              no wonder that the Air ſhould, by the
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              motion of reſtitution, expand it ſelf till
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              it have recovered its more natural dimen­
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              ſions: whereas in our above-mentioned
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              firſt Experiment, and in almoſt all others
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              tryable in our Engine, it appears not
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              that any compreſſion of the Air prece­
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              ded its ſpontaneous Dilatation or Expan­
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              ſion of it ſelf. </s>
              <s>To remove this difficul­
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              ty, I muſt deſire Your Lordſhip to take
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              notice, that of whatever nature the Air,
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              very remote from the Earth, may be, and
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              whatever the Schools may confidently
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              teach to the contrary, yet we have divers
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              Experiments to evince, that the Atmoſ­
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              phere we live in is not (otherwiſe then
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              comparatively to more ponderous Bodies)
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              light, but heavy: And did not their
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              gravity hinder them, it appears not why
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              the ſteams of the Terraqueous Globe, of
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              which our Air in great part conſiſts,
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              ſhould not riſe much higher then the Re­
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              fraction of the Sun, and other Stars
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              give men ground to think, that the At­
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              moſphere, even in the judgement of thoſe </s>
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