Agricola, Georgius, De re metallica, 1912/1950

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              <s>
                <pb pagenum="497"/>
              the second inclined side wall of the hood. </s>
              <s>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. </s>
              <s>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. </s>
              <s>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. </s>
              <s>Since one weight counter-balances another, the
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              rafters on the opposite hoods cannot fall. </s>
              <s>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. </s>
              <s>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. </s>
              <s>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. </s>
              <s>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.</s>
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            <p type="main">
              <s>On the third and the fourth long walls are set twenty-one beams eighteen
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              feet and three palms long. </s>
              <s>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. </s>
              <s>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. </s>
              <s>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.</s>
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              <s>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. </s>
              <s>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. </s>
              <s>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 </s>
            </p>
          </chap>
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    </archimedes>
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