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

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              Sucker were drawn nimbly down. </s>
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              <s>We noted too, that when we began to
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              empty the Receiver, the appearances of
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              Light were much more conſpicuous
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              then towards the latter end, when little
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              Air at a time could paſs out of the Re­
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              ceiver. </s>
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              <s>We obſerv'd alſo, that when the Suc­
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              ker had not been long before well Oyl'd,
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              and inſtead of the great Receiver, the
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              ſmaller Veſſel above-mention'd was em­
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              ploy'd; We obſerv'd, I ſay, that then,
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              upon the opening of the Stop-cock, as
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              the Air deſcended out of the Glaſs in­
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              to the empty'd Cylinder, ſo at the ſame
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              time there aſcended out of the Cylinder
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              into the Veſſel a certain Steam, which
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              ſeem'd to conſiſt of very little Bubbles,
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              or other minute Corpuſcles thrown up
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              from the Oyl, rarefied by the attrition it
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              ſuffered in the Cylinder. </s>
              <s>For at the
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              ſame time that theſe Steams aſcended
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              into the Glaſs, ſome of the ſame kinde
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              manifeſtly iſſued out like a little Pillar of
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              Smoke at the Orifice of the Valve, when
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              that was occaſionally open'd. </s>
              <s>And theſe
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              Steams frequently enough preſenting
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              themſelves to our view, we found, by
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              expoſing the Glaſs to a clear Light, that </s>
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