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