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. </
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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. </
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<
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>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 </
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