Agricola, Georgius, De re metallica, 1912/1950

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    <archimedes>
      <text>
        <body>
          <chap>
            <pb pagenum="284"/>
            <figure number="152"/>
            <p type="caption">
              <s>A—MORTAR. B—UPRIGHT POSTS. C—CROSS-BEAMS. D—STAMPS. E—THEIR HEADS.
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              F—AXLE (CAM-SHAFT). G—TOOTH OF THE STAMP (TAPPET). H—TEETH OF AXLE (CAMS).
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              can remove with a shovel the fine sand, and likewise the coarse sand and
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              broken rock, into which the rocks have been crushed; this board can be
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              lowered, so that the mouth thus being closed, the fresh rock thrown in may
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              be crushed with the iron-shod stamps. </s>
              <s>If an oak block is not available,
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              two timbers are placed on the ground and joined together with iron clamps,
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              each of the timbers being six feet long, a foot wide, and a foot and a half thick.
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              </s>
              <s>Such depth as should be allowed to the mortar, is obtained by cutting out the
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              first beam to a width of three-quarters of a foot and to a length of two and a
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              third and one twenty-fourth of a foot. </s>
              <s>In the bottom of the part thus dug
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              out, there should be laid a very hard rock, a foot thick and three-quarters of a
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              foot wide; about it, if any space remains, earth or sand should be filled in
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              and pounded. </s>
              <s>On the front, this bed rock is covered with a plank; this
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              rock when it has been broken, should be taken away and replaced by
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              another. </s>
              <s>A smaller mortar having room for only three stamps may also be
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              made in the same manner.</s>
            </p>
            <p type="main">
              <s>The stamp-stems are made of small square timbers nine feet long and
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              half a foot wide each way. </s>
              <s>The iron head of each is made in the following </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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