Agricola, Georgius, De re metallica, 1912/1950

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              <s>
                <pb pagenum="318"/>
              the place will permit, extending in every direction more than sixty feet.
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              </s>
              <s>Thus, when the water of the river or stream in autumn and winter inundates
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              the land, the gates of the weir are closed, by which means the current carries
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              the mud mixed with fine tin-stone into the area. </s>
              <s>In spring and summer
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              this mud is washed on the canvas strakes or on the ordinary strake, and
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              even the finest black-tin is collected. </s>
              <s>Within a distance of four thousand
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              fathoms along the bed of the stream or river below the buildings in which
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              the tin-stuff is washed, the miners do not make such weirs, but put inclined
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              fences in the meadows, and in front of each fence they dig a ditch of the
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              same length, so that the mud mixed with the fine tin-stone, carried along by the
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              stream or river when in flood, may settle in the ditch and cling to the fence.
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              </s>
              <s>When this mud is collected, it is likewise washed on canvas strakes and on
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              the ordinary strake, in order that the fine tin-stone may be separated from
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              it. </s>
              <s>Indeed we may see many such areas and fences collecting mud of this
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              kind in Meissen below Altenberg in the river Moglitz,—which is always of a
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              reddish colour when the rock containing the black tin is being crushed under
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              the stamps.</s>
            </p>
            <figure number="177"/>
            <p type="caption">
              <s>A—RIVER. B—WEIR. C—GATE. D—AREA. E—MEADOW. F—FENCE. G—DITCH.</s>
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