Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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true Experiments may, by reaſon of
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the eaſie miſtake of ſome unheeded
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Circumſtance, be unſucceſsfully try'd;
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we will Advertiſe, on this occaſion,
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that we did oftentimes in vain try the
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breaking of Bladders, after the manner
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above-mention'd: Of which the cauſe
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appear'd to be this, That the Bladders we
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could not break, having been brought us
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ready blown from thoſe that ſold them,
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were grown dry before they came to our
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hands: whence it came to paſs, that, if
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we afterwards ty'd them very hard, they
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were apt to fret and ſo become unſervice
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able; and if we ty'd them but moderate
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ly hard, their ſtiffneſs kept them from be
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ing cloſ'd ſo exactly, but that when the
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included Air had in the exhauſted Recei
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ver diſtended them as much as eaſily it
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could, it would in part get out between
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the little wrinkles of the Sphincter of the
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Neck: Whence alſo it uſually happen'd,
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that, upon the letting in the Air from
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without, the Bladders appear'd more flac
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cid and empty then before they were put
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in; whereas when the Bladders were
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brought us moiſt from the Butchers, we
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could, without injuring them, tye their
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necks ſo cloſe, that none of the Air once </
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