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

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1warpe or towe the Foundered Ship at high-water to ſome place
where it may lie a-ground: and by that means upon the Ebbe or
Receſſion of the Tide, it will lie much more above water; and then
you may ſafely unfaſten it from thoſe five or more Tires of Beames,
to which it was at firſt tyed, to hall it to a place of ſafety, as it was
our purpoſe to do; and this ſhall ſucceed as well in an ouzie
tom, as in a Stony, This though you may take notice of, that if
the Cargo of this new Foundred Ship was ſuch, that the things more
grave than the water, did not much exceed the leſs grave, it would
be eaſie to effect the recovery with two Ships, very much leſs than
thoſe which we have ſpoken of above; yet nevertheleſs it will be
good prudence to take them rather bigger than leſſer, that ſo they
may exceed 200000 pounds in Power, rather than want one only
ounce in Act; eſpecially in caſe you would in a deep place at the
firſt motion hoiſt it by meer Force ſomewhat above the Surface of
the water, for in that point alone it will require incomparably much
more force, than in all the other operations.
How you are to preceed, in caſe the Ship ſhould be ſunk in a
place very deep, ſhall be declared in the ſeaventh Explanation.
The
Figures of this Explanation are theſe two that folllow.
The Figure of the two Ships filled with water, to raiſe the Ship that
is ſunk
324[Figure 324]

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