Agricola, Georgius, De re metallica, 1912/1950
page |< < of 679 > >|
    <archimedes>
      <text>
        <body>
          <chap>
            <pb pagenum="366"/>
            <p type="main">
              <s>The upper bellows-board is joined to the head of the bellows in the
                <lb/>
              following way. </s>
              <s>An iron plate
                <emph type="sup"/>
              7
                <emph.end type="sup"/>
              , a palm wide and one and a half palms long,
                <lb/>
              is first fastened to the head at a distance of three digits from the end; from
                <lb/>
              this plate there projects a piece three digits long and two wide, curved
                <lb/>
              in a small circle. </s>
              <s>The other side has a similar plate. </s>
              <s>Then in the same
                <lb/>
              part of the upper board are fixed two other iron plates, distant two digits
                <lb/>
              from the edge, each of which are six digits wide and seven long; in each
                <lb/>
              of these plates the middle part is cut away for a little more than three
                <lb/>
              digits in length and for two in depth, so that the curved part of the plates
                <lb/>
              on the head corresponding to them may fit into this cut out part. </s>
              <s>From
                <lb/>
              both sides of each plate there project pieces, three digits long and two
                <lb/>
              digits wide, similarly curved into small circles. </s>
              <s>A little iron pin is passed
                <lb/>
              through these curved pieces of the plates, like a little axle, so that the upper
                <lb/>
              board of the bellows may turn upon it. </s>
              <s>The little axle is six digits long and a
                <lb/>
              little more than a digit thick, and a small groove is cut out of the upper
                <lb/>
              board, where the plates are fastened to it, in such a manner that the little axle
                <lb/>
              when fixed to the plates may not fall out. </s>
              <s>Both plates fastened to the
                <lb/>
              bellows-board are affixed by four iron nails, of which the heads are on the
                <lb/>
              inner part of the board, whereas the points, clinched at the top, are
                <lb/>
              transformed into heads, so to speak. </s>
              <s>Each of the other plates is fastened
                <lb/>
              to the head of the bellows by means of a nail with a wide head, and by two
                <lb/>
              other nails of which the heads are on the edge of the bellows-head. </s>
              <s>Midway
                <lb/>
              between the two plates on the bellows-board there remains a space two
                <lb/>
              palms wide, which is covered by an iron plate fastened to the board by
                <lb/>
              little nails; and another plate corresponding to this is fastened to the head
                <lb/>
              between the other two plates; they are two palms and the same number
                <lb/>
              of digits wide.</s>
            </p>
            <p type="main">
              <s>The hide is common to the head as to all the other parts of the body;
                <lb/>
              the plates are covered with it, as well as the front part of the upper bellows­
                <lb/>
              board, and both the bows and the back of the head of the bellows, so that the
                <lb/>
              wind may not escape from that part of the bellows. </s>
              <s>It is three palms and as
                <lb/>
              many digits wide, and long enough to extend from one of the sides of the
                <lb/>
              lower board over the back of the upper; it is fastened by many T-headed
                <lb/>
              nails on one side to the upper board, and on the other side to the head of
                <lb/>
              the bellows, and both ends are fastened to the lower bellows-board.</s>
            </p>
            <p type="main">
              <s>In the above manner the bellows is made. </s>
              <s>As two are required for each
                <lb/>
              furnace, it is necessary to have twelve bellows, if there are to be six furnaces
                <lb/>
              in one works.</s>
            </p>
            <p type="main">
              <s>Now it is time to describe their framework. </s>
              <s>First, two sills a little
                <lb/>
              shorter than the furnace wall are placed on the ground. </s>
              <s>The front one of
                <lb/>
              these is three palms wide and thick, and the back one three palms and two
                <lb/>
              digits. </s>
              <s>The front one is two feet distant from the back wall of the furnace, and
                <lb/>
              the back one is six feet three palms distant from the front one. </s>
              <s>They are set into
                <lb/>
              the earth, that they may remain firm; there are some who accomplish this by
                <lb/>
              means of pegs which, through several holes, penetrate deeply into the ground.</s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
Impressum