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.</
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>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. </
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>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.</
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>When the earth is dug up it is first exposed to the sun that it may dry.
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>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. </
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>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. </
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>This sieve, which is not dissimilar to the one </
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>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.</
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