Agricola, Georgius
,
De re metallica
,
1912/1950
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494
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it is twenty feet long, and starts from the fourth long wall. </
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<
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>The sixth
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transverse wall is built also from the fourth long wall, at a point distant
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thirty feet from the fourth transverse wall, and it extends as far as the back
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of the third long wall. </
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<
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>The seventh transverse wall is constructed from
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the second long wall, where this first leaves off, to the third long wall; and
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from the back of the third long wall the eighth transverse wall is built,
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extending to the end of the fourth long wall. </
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<
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>Then the fifth long wall is built
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from the seventh transverse wall, starting at a point nineteen feet from the
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second long wall; it is one hundred and nine feet in length; and at a point
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twenty-four feet along it, the ninth transverse wall is carried to the third end
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of the second long wall, where that begins again. </
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<
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>The tenth transverse wall is
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built from the end of the fifth long wall, and leads to the further end of the
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second long wall; and from there the eleventh transverse wall leads to the
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further end of the first long wall. </
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<
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>Behind the fifth long wall, and five feet
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toward the third long wall, the sixth long wall is built, leading from the
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seventh transverse wall; its length is thirty-five feet, and from its further
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end the twelfth transverse wall is built to the third long wall, and from it the
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thirteenth transverse wall is built to the fifth long wall. </
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<
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>The fourteenth
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transverse wall divides into equal parts the space which lies between the
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seventh transverse wall and the twelfth.</
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<
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>The length, height, breadth, and position of the walls are as above.
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</
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<
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>Their archways, doors, and openings are made at the same time that the walls
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are built. </
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<
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>The size of these and the way they are made will be much better
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understood hereafter. </
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<
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>I will now speak of the furnace hoods and of the roofs.
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</
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<
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>The first side
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2
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of the hood stands on the second long wall, and is similar in
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every respect to those whose structure I explained in Book IX, when I
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described the works in whose furnaces are smelted the ores of gold, silver,
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and copper. </
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<
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>From this side of the hood a roof, which consists of burnt tiles,
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extends to the first long wall; and this part of the building contains the
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bellows, the machinery for compressing them, and the instruments for
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inflating them. </
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<
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>In the middle space, which is situated between the second
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and third transverse walls, an upright post eight feet high and two feet thick </
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