may happen to be betwixt the contigu<lb/>
ous &longs;urfaces of the internal parts of the <lb/>
Stop-cock: And partly that it may be <lb/>
the more ea&longs;ie to turn the Key (S) back<lb/>
wards and forwards. </s> <s>Pretty &longs;tore of oyl <lb/>
mu&longs;t al&longs;o be pour'd into the Cylindre, <lb/>
both that the Sucker may &longs;lip up and <lb/>
down in it the more &longs;moothly and freely, <lb/>
and that the Air might be the better <lb/>
hindred from getting in between them: <lb/>
And for the like rea&longs;ons, a little oyl is to <lb/>
be u&longs;ed al&longs;o about the Valve. </s> <s>Upon <lb/>
which occa&longs;ion, it would not be omitted <lb/>
(for it is &longs;trange) that oftentimes, when <lb/>
neither the pouring in of water, nor even <lb/>
of oyl alone, prov'd capable to make the <lb/>
Sucker move ea&longs;ily enough in the Cylin<lb/>
der; a mixture of both tho&longs;e Liquors <lb/>
would readily (&longs;ometimes even to admi<lb/>
ration) perform the de&longs;ired effect. </s> <s>And <lb/>
la&longs;tly, the bra&longs;s cover of the Receiver, <lb/>
being put into the bra&longs;s ring formerly de<lb/>
&longs;crib'd, that no Air may get between <lb/>
them, it will be very requi&longs;ite to plai&longs;ter <lb/>
over very carefully the upper edges of <lb/>
both, with the plai&longs;ter formerly mention<lb/>
ed, or &longs;ome other as clo&longs;e, which is to be <lb/>
&longs;pread upon the edges with a hot Iron; <lb/>
that being melted, it may run into and