Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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hollow Cylindre, a Sucker, a handle to
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move that Sucker, and a Valve. </
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>The Cylindre was (by a pattern) caſt
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of braſs; it is in length about 14 inches,
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thick enough to be very ſtrong, notwith
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ſtanding the Cylindrical cavity left with
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in it; this cavity is about three inches
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Diameter, and makes as exact a Cylin
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dre as the Artificer was able to bore.
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>This hollow Cylindre is fitted with a ſuck
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er, (4455) conſiſting of two parts, the
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one (44) ſomewhat leſs in Diameter then
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the cavity of the Cylindre, upon which
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is nail'd a good thick piece of tan'd ſhoe
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Leather, which will go ſo cloſe to the
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Cylindre, that it will need to be very
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forcibly knock'd and ram'd in, if at any
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time it be taken out, which is therefore
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done, that it may the more exactly hin
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der the Air from inſinuating it ſelf be
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twixt it and the ſides of the Cylindre
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whereon it is to move. </
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>To the midſt of this former part of the
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Sucker is ſtrongly faſtned the other,
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namely a thick and narrow plate of Iron,
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(55) ſomewhat longer then the Cylindre,
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one of whoſe edges is ſmooth, but at the
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other edge it is indented (as I may ſo
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ſpeak) with a row of teeth delineated in </
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