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

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14
the Scheme, into whose intervals are to
be fitted, the teeth of a small Iron nut;
( [...] ) (as Trades-men call it) which is fast­
ned by two staples (22) to the under side
of the formerly mention'd transverse
board (222) on which the Cylindre rests,
and is turn'd to and fro by the third piece
of this Pump, namely, the handle or
manubrium, (7) of which the Figure gives
a sufficient description.

The fourth and last part of this Cylin­
dre, is the Valve, (R) consisting of a
hole bored through at the top of the Cy­
lindre, a little tapering towards the cavi­
ty; into which hole is ground a tapering
Peg of brass, to be thrust in, and taken
out at pleasure.

The Engine being thus describ'd, it
will be requisite to adde, that something
is wont to be done before it be set on
work, for the more easie moving of the
Sucker, and for the better exclusion of
the outward Air: which when the Vessel
begins to be exhausted, is much more dif­
ficult to be kept out then one would easi­
ly imagine.

There must then be first powr'd in at
the top of the Receiver a little sallad oyl,
partly to fill up any small intervalls that