Salusbury, Thomas, Mathematical collections and translations (Tome I), 1667

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1water can enter in thereat, and this Pole is to be ſomewhat longer
than to reach from the Keel to the upper deck of the ſaid Ship; and
near the other end, put another piece of a Pole croſs wayes; that
you may be able by means of that to rule it; namely, to pull it up,
when you would unſtop the Hole, to let in the water that ſhould
fill the Ship, and to thruſt it down when you would ſtop the Hole
that no more water may enter; and this ſame Pole ſhould paſs
through two Rings, fixed in the Hold of the Ship, which are to
keep the ſaid Pole directly over the Hole, that if you would ſtop it,
the Plugg or Spiggot may not go beſides the Hole, when you thruſt
the Pole downwards.
And that I may be the better underſtood, I
have here below drawn the ſame Pole, with its Tapp or Plugg at the
end.
And when you go about to recover any Ship, you muſt ſtop
the ſaid Holes, till ſuch time as the ſaid Ships are carried
328[Figure 328]
and fitted upon the place, as is ſhewn above.
And
when you would fill them with water, it is but
drawing the ſaid Poles, and opening the Holes; and
faſten them at that ſtay, till you have a mind to ſtop
the Holes; and then look downwards, and obſerve
when the Ships are as full as they can ſwim, or when
they are full enough, which will be in a very ſhort
time: and then let down thoſe Poles, and ſtop the
Holes very cloſe.
And when they are as full as they
need, in the ebb of the Tide, combine the Ship with the Pullies, to
thoſe five or more Orders of Beams often mentioned: and then draw
out the water with Pumps by little and little, and one while out of
one, and another while out of the other Ship, as was appointed in
the ſecond Explication: and in all other particulars proceed, as was
alſo there directed But if the Gravity of thoſe Veſſels, cauſeth
them not to fill faſt enough, you muſt fill them at the top, that is
by baling in water by the Deck (I mean the ſaid Poles being firſt
thruſt down) to make the ſaid Veſſels to deſcend faſter, and to raiſe
the Matter ſubmerged with more Force; many other new wayes
might be ſhewn, as well to empty, as to fill theſe Veſſels; but for
the preſent this ſhall ſuffice.
EXPLANATION XI.
If you would attempt to recover a Ship or other Veſſel by the
wayes here preſcribed: you muſt go about the ſame, when the

Moon is in the Auge of the Excentrick, for at that time the Sea
ebbeth and floweth more than at any other time in the Moneth;
and this happens in her Coujunction and Oppoſition, which is a
matter of great avail in theſe operations: and herewith we conclude
this our firſt Book.

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