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

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              of that colour to be moſt eaſily kindled)
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              & carefully cloſing the Veſſel we brought
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              it to a Window at which the Sun, not very
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              faire from the Meridian, ſhone in very free­
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              ly: then drawing out the Aire with ſpeed
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              united the Sun-beames with a burning
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              Glaſs upon the combuſtible matter which
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              began immediatly to ſend forth a Smoke
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              that quickly darkned the Receiver, but
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              notwithſtanding all our care and diligence
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              the externall Aire got in ſo faſt that after
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              diverſe tryals we were fayne to leave off
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              the Experiment in that Glaſſe and induc'd
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              to make tryall of it in our great Re­
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              ceiver. </s>
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              <s>Haveing then after ſome difficulty
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              lodg'd the combuſtible matter in the ca­
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              vity of this Veſſell in ſuch manner as that
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              it was almoſt contiguous to that ſide
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              thereof that was next the Sun, we did en­
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              deavor with a pretty large burning Glaſs
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              to kindle it, but found, as we fear'd,
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              That by reaſon of the thickneſs of the
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              Glaſs, (which was alſo of a leſs pure and
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              leſs Diaphanous matter then the o­
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              ther) the Sun-beams thrown in by the
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              burning Glaſs, were in their paſſage
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              ſo Diſlocated and Scattered (not now to
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              mention thoſe many that being reflected, </s>
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