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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              from the cover of the Receiver to which
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              it was faſten'd. </s>
              <s>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. </s>
              <s>And one of
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              the Aſſiſtants telling the recurſions of the
                <lb/>
              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. </s>
              <s>Then having carefully
                <lb/>
              drawn away the Air, we did again ſet the
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                <emph type="italics"/>
              Pendulum
                <emph.end type="italics"/>
              in the Receiver a vibrating;
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              and giving the other
                <emph type="italics"/>
              Pendulum
                <emph.end type="italics"/>
              ſuch a mo­
                <lb/>
              tion as made it deſcribe an Arch, accord­
                <lb/>
              ing to ones gheſs, equal to that of the in­
                <lb/>
              cluded
                <emph type="italics"/>
              Pendulum;
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              we reckon'd, one of
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              us, the Recurſions of that
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              Pendulum
                <emph.end type="italics"/>
              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
                <emph type="italics"/>
              medinm
                <emph.end type="italics"/>
              ) the Air. </s>
              <s>But once, one
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              of us reckon'd near two and twenty Re­
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              curſions of the included
                <emph type="italics"/>
              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
                <emph.end type="italics"/>
              that vibrated without. </s>
              <s>And an­
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              other time alſo, the former of theſe
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              Pen-
                <emph.end type="italics"/>
              </s>
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