Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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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. </
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<
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>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. </
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>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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and fitted upon the place, as is ſhewn above. </
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>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. </
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>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.</
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EXPLANATION
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XI.</
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<
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>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.</
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