Agricola, Georgius, De re metallica, 1912/1950

Table of figures

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    <archimedes>
      <text>
        <body>
          <chap>
            <p type="main">
              <s>
                <pb pagenum="362"/>
              building there should be, besides the four long walls, seven transverse walls,
                <lb/>
              of which the first is constructed from the upper end of the first long wall to
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              the upper end of the second long wall; the second proceeds from the end
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              of this to the end of the third long wall; the third likewise from this end of
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              the last extends to the end of the fourth long wall; the fourth leads from
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              the lower end of the first long wall to the lower end of the second long wall;
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              the fifth extends from the end of this to the end of the third long wall; the
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              sixth extends from this last end to the end of the fourth long wall; the
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              seventh divides into two parts the space between the third and fourth long
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              walls.</s>
            </p>
            <p type="main">
              <s>To return to the back part of the building, in which, as I said, are the
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              bellows
                <emph type="sup"/>
              6
                <emph.end type="sup"/>
              , their frames, the machinery for compressing them, and the instru­
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              ment for distending them. </s>
              <s>Each bellows consists of a body and a head.
                <lb/>
              </s>
              <s>The body is composed of two “boards,” two bows, and two hides. </s>
              <s>The
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              upper board is a palm thick, five feet and three palms long, and two and a half
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              feet wide at the back part, where each of the sides is a little curved, and it is
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              a cubit wide at the front part near the head. </s>
              <s>The whole of the body of the
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              bellows tapers toward the head. </s>
              <s>That which we now call the “board”
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              consists of two pieces of pine, joined and glued together, and of two strips of
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              linden wood which bind the edges of the board, these being seven digits
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              wide at the back, and in front near the head of the bellows one and a half
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              digits wide. </s>
              <s>These strips are glued to the boards, so that there shall be less
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              damage from the iron nails driven through the hide. </s>
              <s>There are some people
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              who do not surround the boards with strips, but use boards only, which
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              are very thick. </s>
              <s>The upper board has an aperture and a handle; the
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              aperture is in the middle of the board and is one foot three palms distant
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              from where the board joins the head of the bellows, and is six digits long and
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              four wide. </s>
              <s>The lid for this aperture is two palms and a digit long and wide,
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              and three digits thick; toward the back of the lid is a little notch cut
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              into the surface so that it may be caught by the hand; a groove is cut out
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              of the top of the front and sides, so that it may engage in mouldings a palm
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              wide and three digits thick, which are also cut out in a similar manner under
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              the edges. </s>
              <s>Now, when the lid is drawn forward the hole is closed, and
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              when drawn back it is opened; the smelter opens the aperture a little so that
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              the air may escape from the bellows through it, if he fears the hides might be
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              burst when the bellows are too vigorously and quickly inflated; he, however,
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              closes the aperture if the hides are ruptured and the air escapes. </s>
              <s>Others
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              perforate the upper board with two or three round holes in the same place as
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              the rectangular one, and they insert plugs in them which they draw out </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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