Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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ting into one of theſe, wherein it had but
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little room to expand and diſplay it ſelf,
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might preſs as much upon all parts of the
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internal ſurface of the Veſſel, and upon
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the included Bodies, as a greater quan
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tity of Air in a Veſſel in whoſe capacity
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it might finde more room to expand it
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>The other thing that we were to ad
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vertiſe, is, That 'tis not every ſmall crack
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that can make ſuch a Receiver as is of a
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roundiſh Figure altogether uſeleſs to our
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Experiment, in regard that upon the ex
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ſuction of the internal Air, the ambient
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Air on all ſides preſſing the Glaſs inwards
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or towards the middle, does conſequent
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ly thruſt the Lips of the crack cloſer, and
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ſo rather cloſe then increaſe it. </
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>This I mention partly becauſe Recei
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vers fit for our turn are more eaſily
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crack'd then procur'd, and therefore ought
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not to be unneceſſarily thrown away as
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unſerviceable: And partly becauſe I think
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it becomes one that profeſſes himſelf a
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faithful Relator of Experiments, not to
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conceal from Your Lordſhip, that after a
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few of the foregoing Experiments were
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made, there happen'd in the great Recei
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ver a crack of about a Span long, begin-</
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