Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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to divers ingenious perſons has at firſt
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ſight ſeem'd very wonderful. </
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>THe thing that is wont to be admired,
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and which may paſs for our ſecond
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Experiment is this, That if, when the
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Receiver is almoſt empty, a By-ſtander
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be deſired to lift up the braſs Key (former
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ly deſcribed as a ſtopple in the braſs Co
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ver) he will finde it a very difficult thing
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to do ſo, if the Veſſel be well exhauſted;
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and even when but a moderate quantity of
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Air has been drawn out, he will, when he
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has lifted it up a little, ſo that it is ſome
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what looſe from the ſides of the lip or
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ſocket, which (with the help of a little
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oyl) it exactly filled before, he will (I ſay)
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finde it ſo difficult to be lifted up, that
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he will imagine there is ſome great weight
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faſtned to the bottom of it. </
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>And if (as
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ſometimes has been done for merriment)
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onely a Bladder be tyed to it, it is plea
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ſant to ſee how men will marvail that ſo
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light a Body, filled at moſt but with Air,
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ſhould ſo forcibly draw down their hand
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as if it were fill'd with ſome very ponder
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ous thing: whereas the cauſe of this pret
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ty
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Phænomenon
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ſeems plainly enough to </
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