Agricola, Georgius, De re metallica, 1912/1950
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              crushed to powder, is removed through the open part below; the stamps are
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              not shod with iron, but are made entirely of wood, although at the lower
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              part they are bound round at the wide part by an iron band.</s>
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              <s>The powder into which the charcoal is crushed is thrown on to a sieve
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              whose bottom consists of interwoven withes of wood. </s>
              <s>The sieve is drawn
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              backward and forward over two wooden or iron rods placed in a triangular
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              position on a tub, or over a bench-frame set on the floor of the building;
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              the powder which falls into the tub or on to the floor is of suitable size,
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              but the pieces of small charcoal which remain in the sieve are emptied out
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              and thrown back under the stamps.</s>
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              <s>When the earth is dug up it is first exposed to the sun that it may dry.
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              <s>Later on it is thrown with a shovel on to a screen—set up obliquely and
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              supported by poles,—made of thick, loosely woven hazel withes, and in this
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              way the fine earth and its small lumps pass through the holes of the screen, but
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              the clods and stones do not pass through, but run down to the ground. </s>
              <s>The
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              earth which passes through the screen is conveyed in a two-wheeled cart to
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              the works and there sifted. </s>
              <s>This sieve, which is not dissimilar to the one </s>
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              <s>A—SCREEN. B—POLES. C—SHOVEL. D—TWO-WHEELED CART. E—HAND-SIEVE.
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              F—NARROW BOARDS. G—BOX. H—COVERED PIT.</s>
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