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

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              <s>But the chief thing we deſign'd to do
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              with our Piſtol, was, To obſerve whe­
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              ther Gun-powder would take Fire in our
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              empty'd and cloſely ſtop'd Glaſs? </s>
              <s>Whe­
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              ther the expanſion of the Flame would be
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              conſiderably varied by the abſence of ſo
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              much of the ambient Air as was drawn
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              out of the Receiver? </s>
              <s>and whether the
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              Flame would diffuſe it ſelf upward, as it is
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              wont, notwithſtanding its not having a­
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              bout it the uſual proportion of Air to
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              force it up? </s>
              <s>And though moſt of our at­
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              tempts to fire the Gun-powder in the
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              Pan of the Piſtol ſucceeded not, becauſe
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              we were fain to let it hang almoſt perpen­
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              dicular in the Receiver; whereby the
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              Powder was ſhaken down before the
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              ſparks could reach it: yet once the Ex­
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              periment ſucceeded, and the kindled
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              Powder ſeem'd to make a more expanded
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              Flame then it would have done in the
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              open Air, but mounted upwards accord­
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              ing to its wont, whether by reaſon of that
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              little portion of Air, which in ſpight of
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              our pumping remained in the Receiver, or
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              for any other cauſe, we have not now the
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              leiſure to conſider. </s>
              <s>But we muſt not for­
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              get, that upon the extinction of the Flame
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              the Receiver appear'd darken'd with </s>
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