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. </
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Experi
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ment
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2.</
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<
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>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 </
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