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. </s>
              <s>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. </s>
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              <s>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. </s>
              <s>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 </s>
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