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

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1the 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

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