Boyle, Robert, New experiments physico-mechanicall, touching the spring of the air and its effects, 1660
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              be onely this, That the Air in the Recei­
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              ver, being very much dilated, its Spring
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              muſt be very much weakn'd, and conſe­
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              quently it can but faintly preſs up the
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              lower end of the ſtopple, whereas the
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              Spring of the external Air being no way
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              debilitated, he that a little lifts up the
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              ſtopple muſt with his hand ſupport a preſ­
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              ſure equal to the diſproportion betwixt
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              the force of the internal expanded Air, and
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              that of the Atmoſphere incumbent upon
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              the upper part of the ſame key or ſtopple:
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              And ſo men being unuſ'd to finde any re­
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              ſiſtance, in lifting things up, from the
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              free Air above them, they are forward to
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              conclude that that which depreſſes their
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              hands muſt needs be ſome weight, though
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              they know not where plac'd, drawing be­
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              neath it. </s>
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              Experi­
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              ment
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              2.</s>
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              <s>And that we have not miſ-aſſign'd the
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              cauſe of this
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              Phænomenon
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              ſeems evident
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              enough by this; That as Air is ſuffer­
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              ed by little and little to get into the Re­
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              ceiver, the weight that a man fancies his
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              hand ſupports is manifeſtly felt to decreaſe
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              more and more, the internal Air by this
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              recruit approaching more to an
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              Æquili­
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              brium
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              with the external, till at length the
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              Receiver growing again full of Air, the </s>
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