Boyle, Robert, New experiments physico-mechanicall, touching the spring of the air and its effects, 1660
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              <s>WE took a Glaſs Helmet or Alem­
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              bick (delineated by the ſeventh
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              Figure) ſuch as Chymiſts uſe in Diſtilla­
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              tions, and containing by conjecture be­
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              tween two and three Pints: The
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              Roſtrum
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              or Noſe of it mark'd with
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              (c)
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              was Herme­
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              tically cloſed; and at the top of it was a
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              hole, into which was fitted and cemented
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              one of the Shanks of a middle-ſiz'd Stop­
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              cock; ſo that the Glaſs being turn'd up­
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              ſide-down, the wide Orifice (which in
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              common Glaſs-Helmets is the onely one)
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              was upwards; and to that wide Orifice
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              was fitted a caſt-Cover of Lead, which
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              was carefully cemented on to the Glaſs:
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              Then the other Shank of the Stop-cock
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              being with Cement likewiſe faſten'd into
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              the upper part of the Pump, the exſucti­
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              on of the Air was endeavoured. </s>
              <s>But it
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              was not long before, the remaining Air
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              being made much too weak to ballance
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              the preſſure of the ambient Air, the Glaſs
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              was not without a great noiſe crack'd al­
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              moſt half round, along that part of it
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              where it began to bend inwards: As if
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              in the Figure the crack had been made ac­
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              cording to the Line
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              (ab);
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              and upon an </s>
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