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

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13
hollow Cylindre, a Sucker, a handle to
move that Sucker, and a Valve.

The Cylindre was (by a pattern) cast
of brass; it is in length about 14 inches,
thick enough to be very strong, notwith­
standing the Cylindrical cavity left with­
in it; this cavity is about three inches
Diameter, and makes as exact a Cylin­
dre as the Artificer was able to bore.
This hollow Cylindre is fitted with a suck­
er, (4455) consisting of two parts, the
one (44) somewhat less in Diameter then
the cavity of the Cylindre, upon which
is nail'd a good thick piece of tan'd shoe
Leather, which will go so close to the
Cylindre, that it will need to be very
forcibly knock'd and ram'd in, if at any
time it be taken out, which is therefore
done, that it may the more exactly hin­
der the Air from insinuating it self be­
twixt it and the sides of the Cylindre
whereon it is to move.

To the midst of this former part of the
Sucker is strongly fastned the other,
namely a thick and narrow plate of Iron,
(55) somewhat longer then the Cylindre,
one of whose edges is smooth, but at the
other edge it is indented (as I may so
speak) with a row of teeth delineated in