Agricola, Georgius, De re metallica, 1912/1950

Page concordance

< >
Scan Original
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
< >
page |< < of 679 > >|
    <archimedes>
      <text>
        <body>
          <chap>
            <p type="main">
              <s>
                <pb pagenum="125"/>
              thickness, and high enough that their ends, which are cut square, almost
                <lb/>
              touch the top of the tunnel; then upon them is placed a smaller dressed cap,
                <lb/>
              which is mortised into the heads of the posts: at the bottom, other small
                <lb/>
              timbers, whose ends are similarly squared, are mortised into the posts. </s>
              <s>At
                <lb/>
              each interval of one and a half fathoms, one of these sets is erected; each one
                <lb/>
              of these the miners call a “little doorway,” because it opens a certain amount
                <lb/>
              of passage way; and indeed, when necessity requires it, doors are fixed to the
                <lb/>
              timbers of each little doorway so that it can be closed. </s>
              <s>Then lagging of
                <lb/>
              planks or of poles is placed upon the caps lengthwise, so as to reach from one
                <lb/>
              set of timbers to another, and is laid along the sides, in case some portion of
                <lb/>
              the body of the mountain may fall, and by its bulk impede passage or crush
                <lb/>
              persons coming in or out. </s>
              <s>Moreover, to make the timbers remain stationary,
                <lb/>
              wooden pegs are driven between them and the sides of the tunnel. </s>
              <s>Lastly,
                <lb/>
              if rock or earth are carried out in wheelbarrows, planks joined together are
                <lb/>
              laid upon the sills; if the rock is hauled out in trucks, then two timbers
                <lb/>
              three-quarters of a foot thick and wide are laid on the sills, and, where they
                <lb/>
              join, these are usually hollowed out so that in the hollow, as in a road, the iron
                <lb/>
              pin of the truck may be pushed along; indeed, because of this pin in the
                <lb/>
              groove, the truck does not leave the worn track to the left or right. </s>
              <s>Beneath
                <lb/>
              the sills are the drains through which the water flows away.</s>
            </p>
            <figure number="58"/>
            <p type="caption">
              <s>A—POSTS. B—CAPS. C—SILLS. D—DOORS. E—LAGGING. F—DRAINS.</s>
            </p>
            <p type="main">
              <s>Miners timber drifts in the same way as tunnels. </s>
              <s>These do not, however,
                <lb/>
              require sill-pieces, or drains; for the broken rock is not hauled very far, nor does
                <lb/>
              the water have far to flow. </s>
              <s>If the vein above is metal-bearing, as it sometimes is </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
Impressum