Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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of the Valve, and forcing up of the Suck
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er to the top of the Cylinder again, be
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driven out into the open Air. </
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<
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>And thus
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by the repetition of the motion of the
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Sucker upward and downward, and by op
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portunely turning the Key, and ſtopping
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the Valve, as occaſion requires, more or
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leſs Air may be ſuck'd out of the Recei
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ver, according to the exigency of the Ex
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periment, and the intention of him that
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makes it. </
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>Your Lordſhip will, perhaps, think that
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I have been unneceſſarily prolix in this
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firſt part of my Diſcourſe: But if you
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had ſeen how many unexpected difficul
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ties we found to keep out the externall
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Air, even for a little while, when ſome
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conſiderable part of the internal had been
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ſuckt out; You would peradventure al
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low, that I might have ſet down more
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circumſtances then I have, without ſet
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ting down any, whoſe knowledge, he that
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ſhall try the Experiment may not have
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need of. </
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>Which is ſo true, that, before we
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proceed any further, I cannot think it un
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ſeaſonable to advertiſe Your Lordſhip,
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that there are two chief ſorts of Experi
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ments, which we deſign'd in our Engine
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to make tryal of: The one, ſuch as may </
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