Agricola, Georgius
,
De re metallica
,
1912/1950
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the second inclined side wall of the hood. </
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<
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>Into the ends of the transverse
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beams facing the third long wall, are mortised the ends of the same
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number of rafters rising toward the rafters of the first inclined side of
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the second hood, and in this manner is made the other inclined side of
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the second hood. </
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<
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>But to prevent this from falling in upon the opposite
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inclined side of the hood, and that again upon the opposite vertical one,
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there are many iron rods reaching from some of the rafters to those
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opposite them; and this is also prevented in part by means of a few tie-beams,
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extending from the back of the rafters to the back of those which are behind
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them. </
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<
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>These tie-beams are two palms thick and wide, and have holes made
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through them at each end; each of the rafters is bound round with iron
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bands three digits wide and half a digit thick, which hold together the ends
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of the tie-beams of which I have spoken; and so that the joints may be firm,
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an iron nail, passing through the plate on both sides, is driven through the
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holes in the ends of the beams. </
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<
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>Since one weight counter-balances another, the
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rafters on the opposite hoods cannot fall. </
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>The tie-beams and middle posts
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which have to support the gutters and the roof, are made in every particular
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as I stated above, except only that the second set of middle rafters are not
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longer than the first set of middle rafters, and that the little beams which
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reach from the back of each rafter of the second set of middle rafters nearly
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to the gutter are not longer than the little beams which reach from the back
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of each rafter of the first set of middle rafters almost to the gutter. </
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>In this
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part of the building, against the second long wall, are the furnaces in which
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copper is alloyed with lead, and in which “slags” are re-smelted. </
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<
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>Against
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the third long wall are the furnaces in which silver and lead are liquated from
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copper. </
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<
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>The interior is also occupied by two cranes, of which one deposits
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on the ground the cakes of copper lifted out of the moulding pans; the other
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lifts them from the ground into the second furnace.</
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>On the third and the fourth long walls are set twenty-one beams eighteen
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feet and three palms long. </
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<
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>In mortises in them, two feet behind the third long
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wall, are set the ends of the same number of rafters erected opposite to the
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rafters of the other inclined wall of the second furnace hood, and in this
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manner is made the third inclined wall, exactly similar to the others. </
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<
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>The
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ends of as many rafters are mortised into these beams where they are fixed in
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the fourth long wall; these rafters are erected obliquely, and rest against the
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backs of the preceding ones and support the roof, which consists entirely of
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burnt tiles and has the usual substructures. </
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>In this part of the building
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there are two rooms, in the first of which the cakes of copper, and in the other
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the cakes of lead, are stored.</
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>In the space enclosed between the ninth and tenth transverse walls and
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the second and fifth long walls, a post twelve feet high and two feet wide and
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thick is erected on a rock foundation; it is distant thirteen feet from the
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second long wall, and six from the fifth long wall. </
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<
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>Upon this post and upon
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the ninth transverse wall is laid a beam thirty-three feet and three palms
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long, and two palms wide and thick. </
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<
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>Another beam, also of the same length,
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width and thickness, is laid upon the same post and upon the tenth transverse </
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