Then twelve short posts are erected, whose lower ends are mortised into
the sill that is near the back of the furnace wall; these posts are two feet
high, exclusive of the tenons, and are three palms and the same number of
digits wide, and two palms thick. A slot one and a half palms wide is cut
through them, beginning two palms from the bottom and extending for a
height of three palms. All the posts are not placed at the same intervals, the
first being at a distance of three feet five digits from the second, and likewise
the third from the fourth, but the second is two feet one palm and three
digits from the third; the intervals between the other posts are arranged in
the same manner, equal and unequal, of which each four pertain to two
furnaces. The upper ends of these posts are mortised into a transverse
beam which is twelve feet, two palms, and three digits long, and projects
five digits beyond the first post and to the same distance beyond the fourth;
it is two palms and the same number of digits wide, and two palms thick.
Since each separate transverse beam supports four bellows, it is necessary to
have three of them.
the sill that is near the back of the furnace wall; these posts are two feet
high, exclusive of the tenons, and are three palms and the same number of
digits wide, and two palms thick. A slot one and a half palms wide is cut
through them, beginning two palms from the bottom and extending for a
height of three palms. All the posts are not placed at the same intervals, the
first being at a distance of three feet five digits from the second, and likewise
the third from the fourth, but the second is two feet one palm and three
digits from the third; the intervals between the other posts are arranged in
the same manner, equal and unequal, of which each four pertain to two
furnaces. The upper ends of these posts are mortised into a transverse
beam which is twelve feet, two palms, and three digits long, and projects
five digits beyond the first post and to the same distance beyond the fourth;
it is two palms and the same number of digits wide, and two palms thick.
Since each separate transverse beam supports four bellows, it is necessary to
have three of them.
Behind the twelve short posts the same number of higher posts are
erected, of which each has the middle part of the lower end cut out, so that
its two resulting lower ends are mortised into the back sill; these posts,
exclusive of the tenons, are twelve feet and two palms high, and are five palms
wide and two palms thick. They are cut out from the bottom upward, the
slot being four feet and five digits high and six digits wide. The upper ends of
these posts are mortised into a long beam imposed upon them; this long
beam is placed close under the timbers which extend from the wall at the
back of the furnace to the first long wall; the beam is three palms wide
and two palms thick, and forty-three feet long. If such a long one is
not at hand, two or three may be substituted for it, which when joined together
make up that length. These higher posts are not placed at equal distances,
but the first is at a distance of two feet three palms one digit from the second,
and the third is at the same distance from the fourth; while the second is at a
distance of one foot three palms and the same number of digits from the
third, and in the same manner the rest of the posts are arranged at equal
and unequal intervals. Moreover, there is in every post, where it faces the
shorter post, a mortise at a foot and a digit above the slot; in these mortises
of the four posts is tenoned a timber which itself has four mortises. Tenons
are enclosed in mortises in order that they may be better joined, and they
are transfixed with wooden pins. This timber is thirteen feet three palms
one digit long, and it projects beyond the first post a distance of two palms
and two digits, and to the same number of palms and digits beyond the
fourth post. It is two palms and as many digits wide, and also two palms
thick. As there are twelve posts it is necessary to have three timbers of this
kind.
erected, of which each has the middle part of the lower end cut out, so that
its two resulting lower ends are mortised into the back sill; these posts,
exclusive of the tenons, are twelve feet and two palms high, and are five palms
wide and two palms thick. They are cut out from the bottom upward, the
slot being four feet and five digits high and six digits wide. The upper ends of
these posts are mortised into a long beam imposed upon them; this long
beam is placed close under the timbers which extend from the wall at the
back of the furnace to the first long wall; the beam is three palms wide
and two palms thick, and forty-three feet long. If such a long one is
not at hand, two or three may be substituted for it, which when joined together
make up that length. These higher posts are not placed at equal distances,
but the first is at a distance of two feet three palms one digit from the second,
and the third is at the same distance from the fourth; while the second is at a
distance of one foot three palms and the same number of digits from the
third, and in the same manner the rest of the posts are arranged at equal
and unequal intervals. Moreover, there is in every post, where it faces the
shorter post, a mortise at a foot and a digit above the slot; in these mortises
of the four posts is tenoned a timber which itself has four mortises. Tenons
are enclosed in mortises in order that they may be better joined, and they
are transfixed with wooden pins. This timber is thirteen feet three palms
one digit long, and it projects beyond the first post a distance of two palms
and two digits, and to the same number of palms and digits beyond the
fourth post. It is two palms and as many digits wide, and also two palms
thick. As there are twelve posts it is necessary to have three timbers of this
kind.
On each of these timbers, and on each of the cross-beams which are laid
upon the shorter posts, are placed four planks, each nine feet long, two palms
three digits wide, and two palms one digit thick. The first plank is five feet
one palm one digit distant from the second, at the front as well as at the back.
upon the shorter posts, are placed four planks, each nine feet long, two palms
three digits wide, and two palms one digit thick. The first plank is five feet
one palm one digit distant from the second, at the front as well as at the back.
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