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

Table of figures

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              between two round Boards of ſomewhat a greater Diameter than
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              the Globe, with four pillars, as in the enſuing figure doth graphically
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              appear. </s>
              <s>But in the round Board which is put over the hole or mouth
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              of the ſaid Globe, you muſt alſo make a round hole ſomewhat
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              rower than that of the Globe, but yet big enough for a man to paſſe
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              in and out thereat. </s>
              <s>Afterwards under this round Board ſo bored,
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              you muſt place and fix another round bored piece of Lead of ſuch
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              thickneſſe, as that it may be able to draw the ſaid Ball or Globe of
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              Glaſſe, together with the Diver in ſuch manner under Water, that
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              the upper round Board do reſt in the Surface of the Water, namely,
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              that it may not be ſo heavy as to ſink the Globe and Diver to the
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              bottome, but only to retain it beneath the Surface of the Water,
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              which by tryal may be eaſily proportioned, namely, by adding or
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              taking away Lead from the Baſe, according as occaſion ſhall require.
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              <s>Next you are to frame a ſeat for the Diver to ſit commodiouſly in
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              the ſaid Ball or Globe, and next faſten a Ball of Lead to the end of
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              a Rope, as many fathom long as the water is deep into which you
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              would deſcend, and ſomewhat more, as was ſaid in the preceding
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              Explanation. </s>
              <s>And that Ball of Lead ſhould be of ſuch bigneſſe, that
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              applied to the ſaid Model, it may be ſufficient to make it deſcend to
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              the bottome leiſurely, or ſwiftly, as he ſeeth cauſe who is to dive.
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              <s>And make an handle or peg in the ſaid Globe whereat to faſten or
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              belay the other end of
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              the ſaid Rope, and to
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              draw it eaſily upwards,
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                <figure id="id.040.01.1195.1.jpg" xlink:href="040/01/1195/1.jpg" number="330"/>
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              or let it looſe at the
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              pleaſure of him that is
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              within, and this may be
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              eaſily done by joyning
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              and faſtening four
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              pieces of wood upright
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              in the mouth or hole of
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              that bored Board and
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              Lead, which ſhall be
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              about the mouth of the
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              ſaid Globe; and that
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              I may be the better
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              underſtood, I will give
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              it you in figure with the
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              Diver ſitting therein.
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              <s>If you would deſcend to the bottome of ſome deep water by help
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              of this Machine, you are to proceed according to the directions
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              ven in the precedent Explanation.</s>
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