Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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from the cover of the Receiver to which
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it was faſten'd. </
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<
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>Then (by inclining the
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Engine) we made the
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Pendulum
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ſwing too
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and fro in it, and deſcrib'd as long Arches
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as in the capacity of ſo brittle a Veſſel we
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thought ſafe and convenient. </
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<
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>And one of
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the Aſſiſtants telling the recurſions of the
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other
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Pendulum
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hanging in the free Air,
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by a ſtring of about the ſame length, we
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ſhorten'd and lengthen'd this other
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Pen
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dulum,
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till it appear'd to keep the ſame
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pace in its Vibrations, with that ſhut up in
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the Receiver. </
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<
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>Then having carefully
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drawn away the Air, we did again ſet the
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Pendulum
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in the Receiver a vibrating;
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and giving the other
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Pendulum
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ſuch a mo
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tion as made it deſcribe an Arch, accord
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ing to ones gheſs, equal to that of the in
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cluded
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Pendulum;
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we reckon'd, one of
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us, the Recurſions of that
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Pendulum
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which
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was ſwinging within the Receiver; and
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another of us that which was moving in
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(that which one would think a much more
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reſiſting
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medinm
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) the Air. </
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<
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>But once, one
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of us reckon'd near two and twenty Re
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curſions of the included
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Pendulum,
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whilſt
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the other reckon'd but twenty of the
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Pen
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dulum
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that vibrated without. </
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<
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>And an
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other time alſo, the former of theſe
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Pen-
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