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

Table of figures

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              chine and perſon in it under Water, but ſo, that the ſupreme or up
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              per part of the ſame, that is the uppermoſt round Board, may ſtay at
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              the Superficies of the Water; that is, if the Lead chance to be ſo
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              ponderous, that it cauſe the Engine to ſink leiſurely to the bottome,
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              you muſt take away ſome of the ſaid Lead; and on the contrary,
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              if it chance that the Lead be not able to draw it all in that manner
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              under Water, ſo as to make the ſaid upper round Board to lye and
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              ſtay exactly level with the Surface of the Water, but that a part of it
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              reſts viſible above the Water, you muſt encreaſe the ſaid Lead ſo,
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              that the upper Board may lye and abide preciſely, as was ſaid
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              fore, in the Surface of the Water: and when you have thus
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              ſted the ſaid Lead, I would have you take a Ball or Bullet of Lead
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              weighing two or three pounds, (that is to ſay of ſuch a weight, that
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              it may be ſufficient to make the Machine and perſon diving to
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              ſcend to the bottome as oft as it is interpoſed, or added,) with an
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              Iron Ring in the ſaid Ball, to which bend or faſten a Rope as long as
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              the ſaid Water is deep, in which the Diver is to deſcend, and
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              what more; and reeve or paſſe the other end of the ſaid
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              Cord through the hole
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              made in the Board and
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              Lead through the
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                <figure id="id.040.01.1192.1.jpg" xlink:href="040/01/1192/1.jpg" number="329"/>
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              tom of the Model; and
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              faſten that ſame end
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              of the Cord in a place
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              of the Machine, ſo, that
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              the Diver may take it,
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              and draw it, or ſlack
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              it as he pleaſeth: and
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              this being done, the
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              ſaid Machine will be
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              finiſhed. </s>
              <s>And that you
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              may better
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              ſtand it, I have here
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              ſerted it graphically:
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              yet I ſhould have told
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              you, that for many
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              ons you ſhould in the beginning have faſtened a Ring in the
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              tre of the upper Board, on the outſide, to tye a Cord to the ſame as
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              occaſion ſerveth.</s>
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