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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              .</s>
              <s>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.</s>
              <s>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 </s>
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