Boyle, Robert, New experiments physico-mechanicall, touching the spring of the air and its effects, 1660
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              but that they moved ſome of them up­
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              wards, as well as ſome of them down­
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              wards, and ſome of them ſide-ways, as
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              they are wont to do, when upon ſuch col­
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              liſions they fly out in the open Air. </s>
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              Experi­
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              ment
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              14.</s>
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              <s>We likewiſe cauſ'd a piece of Steel to
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              be made of the form and bigneſs of the
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              Flint, in whoſe place we put it, and then
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              the Piſtol being cock'd and conveyed in­
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              to the Receiver, the Trigger was pull'd
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              after the Air was drawn out: And though
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              the place were purpoſely ſomewhat dar­
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              ken'd, yet there appear'd not upon the
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              ſtriking of the two Steels againſt each o­
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              ther the leaſt ſpark of Fire: Nor did we
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              expect any (having before in vain attem­
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              pted to ſtrike Fire this way in the open
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              Air) though we thought fit to make the
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              Experiment to undeceive thoſe who fan­
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              cy in rarified Air, I know not what ſtrange
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              diſpoſition, to take Fire upon a much
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              ſlighter occaſion then this Experiment
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              afforded. </s>
              <s>We have indeed found, that
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              by the dextrous Colliſion of two har­
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              den'd pieces of Steel, ſtore of ſparks
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              may be ſtruck out: But that was done with
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              ſuch vehement percuſſion of the edges of
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              the two Steels, as could not well be com­
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              paſſ'd in our Receiver. </s>
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