Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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[Figure 330]
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[Figure 331]
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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. </
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>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. </
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>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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>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. </
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>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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>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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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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>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.</
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