Agricola, Georgius, De re metallica, 1912/1950

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              the cam-shaft; in this case the cams on both sides raise the stamps, which
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              either both crush dry or wet ore, or else the one set crushes dry ore and the
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              other set wet ore, just as circumstances require the one or the other;
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              further, when the one set is raised and the iron clavises in them are fixed
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              into openings in the first cross-beam, the other set alone crushes the ore.</s>
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              <s>Broken rock or stones, or the coarse or fine sand, are removed from
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              the mortar of this machine and heaped up, as is also done with the same
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              materials when raked out of the dump near the mine. </s>
              <s>They are thrown
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              by a workman into a box, which is open on the top and the front, and is three
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              feet long and nearly a foot and a half wide. </s>
              <s>Its sides are sloping and made
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              of planks, but its bottom is made of iron wire netting, and fastened with
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              wire to two iron rods, which are fixed to the two side planks. </s>
              <s>This bottom
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              has openings, through which broken rock of the size of a hazel nut cannot
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              pass; the pieces which are too large to pass through are removed by the
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              workman, who again places them under stamps, while those which have
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              passed through, together with the coarse and fine sand, he collects in a large
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              vessel and keeps for the washing. </s>
              <s>When he is performing his laborious </s>
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            <figure number="155"/>
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              <s>A—BOX LAID FLAT ON THE GROUND. B—ITS BOTTOM WHICH IS MADE OF IRON WIRE.
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              C—BOX INVERTED. D—IRON RODS. E—BOX SUSPENDED FROM A BEAM, THE INSIDE
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              BEING VISIBLE. F—BOX SUSPENDED FROM A BEAM, THE OUTSIDE BEING VISIBLE.</s>
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