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

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              <s>
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              Water; but knowing how to ſwim, he may enter, aſcend, and
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              deſcend of himſelf, without any help.</s>
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            <p type="head">
              <s>
                <emph type="italics"/>
              EXPLANATION
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              III.</s>
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            <p type="main">
              <s>But if you chance to be in a place where you cannot procure
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              the ſaid Globe to be made of Glaſſe, it may be made of Wood;
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              but then you muſt make therein great Sights, or Eyeholes of
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              clear Glaſſe of each ſide to look four ſeverall wayes; and pay it
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              without, and alſo within if you ſee cauſe with Pitch. </s>
              <s>And if you
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              cannot get ſuch a Ball of Wood, you may make ſhift with a little
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              Cubicall Cheſt or Boxe, like one of thoſe Cheſts wherein they plant
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              Ceaders, which muſt be well joyned graved and pitch't, with four
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              ſuch Sights of Glaſſe as before, namely one upon every lateral flat
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              or plain, ſo placed, that the Diver may ſee through them every way,
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              and be able to look downwards, it would be good to make the
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              Box ſomewhat narrower towards the mouth, that ſo the four
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              rall Planes may look ſomewhat ſloping: and in the entrance,
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              ſcent, aſcent, and coming forth, you are to uſe the ſame Rules as
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              fore; aud if you have a deſire to deſcend faſter, you muſt make the
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              Ball of Lead ſomewhat heavier, that was tyed to the end of the
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              Corde, and this done the Machine ſhall deſcend faſter to the bottom
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              upon halling the ſaid Corde and Ball; and when you vere or let
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              looſe the Cord, the Engine will re-aſcend but according to its former
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              ſpeed: But if you would alſo make it ſwifter in its aſcent you are
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              to proceed quite contrary, that is, you muſt ſomewhat diminiſh the
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              Lead, which is under the Baſe of the fiame; and the more you
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              miniſh the ſaid Lead, the ſwifter ſhall it be in aſcending. </s>
              <s>But you
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              muſt remember withall to encreaſe the Ball of Lead, ſo that it may
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              be able to draw the ſaid Machine to the bottome ſpeedily or
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              ly according as occaſion requires.</s>
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            <p type="head">
              <s>
                <emph type="italics"/>
              EXPLANATION
                <emph.end type="italics"/>
              IV.</s>
            </p>
            <p type="main">
              <s>But if there be any likelihood of any obnoxious Fiſh in the place
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              where the Diver is to deſcend, that may hurt him, being quite
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              ked; though that in the former kind of Machine with four pillars you
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              may ſe u e him with a wire Grate, made in the manner of doors to the
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              ſame, yet to the end that you may know that this Invention may be
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              varied ſundry ways; you may in this caſe have a Globe of tranſparent
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              glaſs made at
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              Murano,
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              of ſuch a bigneſs, that a man ſtanding on his feet,
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              or elſe ſitting, may be contain'd therein, having amouth or round hole
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              of capacity ſufficient for a man, commodiouſly to enter and goe out
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              thereby, and ſomewhat larger: & then coffin or encloſe the ſaid Globe </s>
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