Boyle, Robert, New experiments physico-mechanicall, touching the spring of the air and its effects, 1660
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              <s>For the more eaſie underſtanding of the
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              Experiments tryable by our Engine, I
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              thought it not ſuperfluous, nor unſeaſon­
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              able in the recital of this firſt of them, to
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              inſinuate that notion by which it ſeems
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              likely that moſt, if not all, of them will
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              prove explicable. </s>
              <s>Your Lordſhip will
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              eaſily ſuppoſe, that the Notion I ſpeak
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              of is, That there is a Spring, or Elaſti­
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              cal power in the Air we live in. </s>
              <s>By which
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                <foreign lang="grc">ἐλατγ̀ρ</foreign>
              or Spring of the Air, that which
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              I mean is this: That our Air either con­
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              ſiſts of, or at leaſt abounds with, parts of
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              ſuch a nature, that in caſe they be bent or
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              compreſſ'd by the weight of the incum­
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              bent part of the Atmoſphere, or by any o­
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              ther Body, they do endeavor, as much as
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              in them lies, to free themſelves from that
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              preſſure, by bearing againſt the contigu­
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              ous Bodies that keep them bent; and,
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              aſſoon as thoſe Bodies are remov'd or
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              reduced to give them way, by preſently
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              unbending and ſtretching out themſelves,
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              either quite, or ſo far forth as the con­
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              tiguous Bodies that reſiſt them will per­
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              mit, and thereby expanding the whole
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              parcel of Air, theſe elaſtical Bodies com­
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              poſe. </s>
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