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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              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. </s>
              <s>We obſerv'd alſo, that when the
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              Receiver was full of Air, the included
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                <emph type="italics"/>
              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. </s>
              <s>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. </s>
              <s>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. </s>
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