Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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dula
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was reckon'd to have made one and
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twenty Recurſions, wherein the other
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made but twenty: Yet this Experiment
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ſeem'd to teach us little, ſave that the dif
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ference betwixt the motion of ſuch a
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Pen
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dulum
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in the common Air, and in one ex
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ceedingly rarified, is ſcarce ſenſible in
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Veſſels no bigger then our Receiver; e
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ſpecially ſince though during this Expe
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riment it held very well, yet we could
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not ſuppoſe it to be altogether devoid of
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Air. </
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<
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>We obſerv'd alſo, that when the
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Receiver was full of Air, the included
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Pendulum
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continu'd its Recurſions about
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fifteen minutes (or a quarter of an hour)
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before it left off ſwinging; and that after
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the exſuction of the Air, the Vibration
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of the ſame
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Pendulum
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(being freſh put in
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to motion) appear'd not (by a minutes
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Watch) to laſt ſenſibly longer. </
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<
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>So that
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the event of this Experiment being other
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then we expected, ſcarce afforded us any
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other ſatisfaction, then that of our not
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having omitted to try it. </
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<
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>And whether
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in caſe the tryal be made with a
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Pendulum
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much leſs diſproportionate to the Air then
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Steel is, the event will much better an
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ſwer expectation, experience may be con
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ſulted. </
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