Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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der that attracted this weight to obviate
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a
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Vacuum,
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will ſcarce be ſatisfactory; un
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leſs it can be cleerly made out by what li
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tle hooks, or other grappling Inſtruments,
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the internal Air could take hold of the
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Sucker; how ſo litle of it obtain'd the
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force to lift up ſo great a weight; and why
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alſo, upon the letting in of a litle more
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Air into one of our evacuated Veſ
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ſels, the attraction is, inſtead of being
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ſtrengthen'd, much weaken'd, though,
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if there were danger of a
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Vacuum
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be
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fore, it would remain, notwithſtanding
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this ingreſs of a little Air. </
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>For that ſtill
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there remain'd in the capacity of the ex
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hauſted Cylinder ſtore of little rooms,
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or ſpaces empty or devoid of Air, may
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appear by the great violence wherewith
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the air ruſhes in, if any way be open'd to it.
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<
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>And that 'tis not ſo much the decrement
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of the
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Vacuum
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within the cavity of the
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veſſel that debilitates the attraction, as the
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ſpring of the included air (whoſe preſence
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makes the decrement) that does it by
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reſiſting the preſſure of the external Air,
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ſeems probable, partly from the Diſabi
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lity of vacuities, whether greater or leſſer,
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to reſiſt the preſſure of the Air; and part
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ly by ſome of the
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Phænomena
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of our Ex-</
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