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

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              and
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              R. Hook
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              (who hath alſo the Honor to
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              be known to your Lordſhip, and was with
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              me when I had theſe things under conſi­
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              deration) to contrive ſome Air Pump,
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              that might not, like the other, need to
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              be kept under water (which on divers oc­
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              caſions is inconvenient) & might be more
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              eaſily manag'd: And after an unſucceſsful
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              try all or two of ways propoſ'd by o­
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              thers, the laſt nam'd Perſon fitted me
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              with a Pump, anon to be deſcrib'd. </s>
              <s>And
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              thus the firſt Imperfection of the
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              German
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              Engine, was in good meaſure, though
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              not perfectly, remedy'd: And to ſupply
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              the ſecond deſect, it was conſidered that
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              it would not perhaps prove impoſſible to
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              leave in the Glaſs to be empty'd, a hole
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              large enough to put in a Mans Arm
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              cloath'd; and conſequently other Bodies,
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              not bigger then it, or longer then the in­
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              ſide of the Veſſel. </s>
              <s>And this Deſign
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              ſeem'd the more hopefull, becauſe I re­
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              membred, that having ſeveral years be­
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              fore often made the Experiment
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              De Va­
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              cuo
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              with my own hands; I had, to exa­
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              mine ſome conjectures that occurr'd to
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              me about it, cauſed Glaſſes to be made
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              with a hole at that end, which uſes to be
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              ſeal'd up, and had nevertheleſs been able </s>
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