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

Table of figures

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              <s>
                <pb xlink:href="040/01/1189.jpg" pagenum="499"/>
              water can enter in thereat, and this Pole is to be ſomewhat longer
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              than to reach from the Keel to the upper deck of the ſaid Ship; and
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              near the other end, put another piece of a Pole croſs wayes; that
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              you may be able by means of that to rule it; namely, to pull it up,
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              when you would unſtop the Hole, to let in the water that ſhould
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              fill the Ship, and to thruſt it down when you would ſtop the Hole
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              that no more water may enter; and this ſame Pole ſhould paſs
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              through two Rings, fixed in the Hold of the Ship, which are to
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              keep the ſaid Pole directly over the Hole, that if you would ſtop it,
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              the Plugg or Spiggot may not go beſides the Hole, when you thruſt
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              the Pole downwards. </s>
              <s>And that I may be the better underſtood, I
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              have here below drawn the ſame Pole, with its Tapp or Plugg at the
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              end. </s>
              <s>And when you go about to recover any Ship, you muſt ſtop
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              the ſaid Holes, till ſuch time as the ſaid Ships are carried
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                <figure id="id.040.01.1189.1.jpg" xlink:href="040/01/1189/1.jpg" number="328"/>
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              and fitted upon the place, as is ſhewn above. </s>
              <s>And
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              when you would fill them with water, it is but
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              drawing the ſaid Poles, and opening the Holes; and
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              faſten them at that ſtay, till you have a mind to ſtop
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              the Holes; and then look downwards, and obſerve
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              when the Ships are as full as they can ſwim, or when
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              they are full enough, which will be in a very ſhort
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              time: and then let down thoſe Poles, and ſtop the
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              Holes very cloſe. </s>
              <s>And when they are as full as they
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              need, in the ebb of the Tide, combine the Ship with the Pullies, to
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              thoſe five or more Orders of Beams often mentioned: and then draw
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              out the water with Pumps by little and little, and one while out of
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              one, and another while out of the other Ship, as was appointed in
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              the ſecond Explication: and in all other particulars proceed, as was
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              alſo there directed But if the Gravity of thoſe Veſſels, cauſeth
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              them not to fill faſt enough, you muſt fill them at the top, that is
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              by baling in water by the Deck (I mean the ſaid Poles being firſt
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              thruſt down) to make the ſaid Veſſels to deſcend faſter, and to raiſe
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              the Matter ſubmerged with more Force; many other new wayes
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              might be ſhewn, as well to empty, as to fill theſe Veſſels; but for
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              the preſent this ſhall ſuffice.</s>
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              <s>
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              EXPLANATION
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              XI.</s>
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              <s>If you would attempt to recover a Ship or other Veſſel by the
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              wayes here preſcribed: you muſt go about the ſame, when the
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              Moon is in the Auge of the Excentrick, for at that time the Sea
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              ebbeth and floweth more than at any other time in the Moneth;
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              and this happens in her Coujunction and Oppoſition, which is a
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              matter of great avail in theſe operations: and herewith we conclude
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              this our firſt Book.</s>
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