1fastened in it.
The pipe is made of a rolled copper or iron plate, a foot and
two palms and the same number of digits long; the plate is half a digit
thick, but a digit thick at the back. The interior of the pipe is three digits
wide, and two and a half digits high in the front, for it is not absolutely round;
and at the back it is a foot and two palms and three digits in diameter. The
plate from which the pipe is made is not entirely joined up, but at the front
there is left a crack half a digit wide, increasing at the back to three digits.
This pipe is placed in the hole in the furnace, which, as I said, was in the
middle of the wall and the arch. The nozzles of the bellows, placed in this
pipe, are a distance of five digits from its front end.
two palms and the same number of digits long; the plate is half a digit
thick, but a digit thick at the back. The interior of the pipe is three digits
wide, and two and a half digits high in the front, for it is not absolutely round;
and at the back it is a foot and two palms and three digits in diameter. The
plate from which the pipe is made is not entirely joined up, but at the front
there is left a crack half a digit wide, increasing at the back to three digits.
This pipe is placed in the hole in the furnace, which, as I said, was in the
middle of the wall and the arch. The nozzles of the bellows, placed in this
pipe, are a distance of five digits from its front end.
The levers are of the same number as the bellows, and when depressed
by the cams of the long axle they compress the bellows. These levers
are eight feet three palms long, one palm wide and thick, and the ends are
inserted in the slots of the posts; they project beyond the front posts to a
distance of two palms, and the same distance beyond the back posts in order
that each may have its end depressed by its two cams on the axle. The
cams not only penetrate into the slots of the back posts, but project three
digits beyond them. An iron pin is set in round holes made through both
sides of the slot of each front post, at three palms and as many digits from the
bottom; the pin penetrates the lever, which turns about it when depressed
or raised. The back of the lever for the length of a cubit is a palm and a
digit wider than the rest, and is perforated; in this hole is engaged a bar
six feet and two palms long, three digits wide, and about one and one-half
digits thick; it is somewhat hooked at the upper end, and approaches the
handle of the bellows. Under the lever there is a nail, which penetrates
through a hole in the bar, so that the lever and bar may move together. The
bar is perforated in the upper end at a distance of six digits from the top;
this hole is two palms long and a digit wide, and in it is engaged the hook of
an iron implement which is a digit thick. At the upper part this implement
has either a round or square opening, like a link, and at the lower end is
hooked; the link is two digits high and wide and the hook is three digits long;
the middle part between the link and the hook is three palms and two
digits long. The link of this implement engages either the handle of the
bellows, or else a large ring which does engage it. This iron ring is a digit thick,
two palms wide on the inside of the upper part, and two digits in the
lower part, and this iron ring, not unlike the first one, engages the
handle of the bellows. The iron ring either has its narrower part turned
upward, and in it is engaged the ring of another iron implement, similar
to the first, whose hook, extending upward, grips the rope fastened to the
iron ring holding the end of the second lever, of which I will speak
presently; or else the iron ring grips this lever, and then in its hook is
engaged the ring of the other implement whose ring engages the handle of the
bellows, and in this case the rope is dispensed with.
by the cams of the long axle they compress the bellows. These levers
are eight feet three palms long, one palm wide and thick, and the ends are
inserted in the slots of the posts; they project beyond the front posts to a
distance of two palms, and the same distance beyond the back posts in order
that each may have its end depressed by its two cams on the axle. The
cams not only penetrate into the slots of the back posts, but project three
digits beyond them. An iron pin is set in round holes made through both
sides of the slot of each front post, at three palms and as many digits from the
bottom; the pin penetrates the lever, which turns about it when depressed
or raised. The back of the lever for the length of a cubit is a palm and a
digit wider than the rest, and is perforated; in this hole is engaged a bar
six feet and two palms long, three digits wide, and about one and one-half
digits thick; it is somewhat hooked at the upper end, and approaches the
handle of the bellows. Under the lever there is a nail, which penetrates
through a hole in the bar, so that the lever and bar may move together. The
bar is perforated in the upper end at a distance of six digits from the top;
this hole is two palms long and a digit wide, and in it is engaged the hook of
an iron implement which is a digit thick. At the upper part this implement
has either a round or square opening, like a link, and at the lower end is
hooked; the link is two digits high and wide and the hook is three digits long;
the middle part between the link and the hook is three palms and two
digits long. The link of this implement engages either the handle of the
bellows, or else a large ring which does engage it. This iron ring is a digit thick,
two palms wide on the inside of the upper part, and two digits in the
lower part, and this iron ring, not unlike the first one, engages the
handle of the bellows. The iron ring either has its narrower part turned
upward, and in it is engaged the ring of another iron implement, similar
to the first, whose hook, extending upward, grips the rope fastened to the
iron ring holding the end of the second lever, of which I will speak
presently; or else the iron ring grips this lever, and then in its hook is
engaged the ring of the other implement whose ring engages the handle of the
bellows, and in this case the rope is dispensed with.
Resting on beams fixed in the two walls is a longitudinal beam, at a
distance of four and a half feet from the back posts; it is two palms wide,
distance of four and a half feet from the back posts; it is two palms wide,
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