Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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his Imployment: after which the aire be-
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ing leaſurely let in againe, the ſcales by
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degrees returned to their former
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Aequili-
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brium
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>After that we tooke them out, and
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caſting into that ſcale to which the lead
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belong'd three quarters of a grain, we
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convey'd the ballance into the Recei-
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ver, which being cloſed up, and exhau-
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ſted as before, we obſerv'd, that as the
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aire was drawne out more and more, ſo
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the glaſſe bubble came neerer and neer-
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er to an
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Aequilibrium
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with the other
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weight, till at length the beame was
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drawne to hang horizontall; which (as
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we had found by another tryall) wee
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could not bring it to do, when a quar-
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ter of a Graine more was added to
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the ſcale, to which the lead belong'd:
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though it ſeem'd queſtionleſſe, that if
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wee could have perfectly empty'd the
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Receiver of the contain'd aire, that in-
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cluded, in the bubble would have weigh-
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ed above a grain, notwithſtanding its
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having been probably ſomewhat Rari-
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fy'd by the flame by the help of which,
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the bubble was ſeald up.</
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<
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>Let us adde,
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that on the regreſſe of the excluded
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air, the Lead, and the weight caſt into the </
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