Boyle, Robert, New experiments physico-mechanicall, touching the spring of the air and its effects, 1660

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              <s>
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              ed, deſerves the name of a true
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              Vacuum
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              ,
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              and though we cannot yet perfectly free
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              it from Air it ſelf, yet we thought fit to
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              try how far the Air would manifeſt its
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              gravity in ſo thin a medium, as we could
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              make in our Receiver, by evacuating it.
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              </s>
              <s>We cauſ'd then to be blown at the Flame
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              of a Lamp, a Glaſs-bubble of about
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              the bigneſs of a small Hen egge, and of
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              an Oval form, ſave that at one end there
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              was drawn out an exceeding flender Pipe,
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              that the Bubble might be ſeal'd up, with
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              as little rarifaction as might be, of the
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              Air included in the great or ovall Cavi-
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              ty of it.</s>
              <s>This Glaſs being ſeal'd, was fa-
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              ſtened to one of the Scales of the exact
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              pair of Ballances formerly mention'd;
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              and being counterpoiſ'd with a weight of
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              Lead, was convey'd into the Receiver,
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              and cloſ'd up in it.</s>
              <s>The Beam appearing
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              to continue Horizontal, the Pump was ſet
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              awork, and there ſcarce paſt above two
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              or three Exſuctions of the Air, before
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              the Ballance loſt its
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              Aequilibrium
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              , and
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              began to incline to that ſide on which
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              the Bubble was; which, as the Air was
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              further and further drawn out, did mani-
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              feſtly more and more preponderate, till
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              he that pump'd began to grow weary of</s>
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