1they are
a palm wide and two and a half digits thick, and it is necessary
that they should be three digits apart, as were the rundles.
that they should be three digits apart, as were the rundles.
The axle should have a thickness in proportion to the spokes and the
segments. As it has two cams to depress each of the levers, it is necessary that
it should have twenty-four cams, which project beyond it a foot and a palm and
a digit. The cams are of almost semicircular shape, of which the widest part is
three palms and a digit wide, and they are a palm thick; they are
distributed according to the four sides of the axle, on the upper, the lower
and the two lateral sides. The axle has twelve holes, of which the first
penetrates through from the upper side to the lower, the second from one
lateral side to the other; the first hole is four feet two palms distant from
the second; each alternate one of these holes is made in the same direc
tion, and they are arranged at equal intervals. Each single cam must
be opposite another; the first is inserted into the upper part of the first
hole, the second into the lower part of the same hole, and so fixed by
pegs that they do not fall out; the third cam is inserted into that part
of the second hole which is on the right side, and the fourth into that
part on the left. In like manner all the cams are inserted into the consecutive
holes, for which reason it happens that the cams depress the levers of the
segments. As it has two cams to depress each of the levers, it is necessary that
it should have twenty-four cams, which project beyond it a foot and a palm and
a digit. The cams are of almost semicircular shape, of which the widest part is
three palms and a digit wide, and they are a palm thick; they are
distributed according to the four sides of the axle, on the upper, the lower
and the two lateral sides. The axle has twelve holes, of which the first
penetrates through from the upper side to the lower, the second from one
lateral side to the other; the first hole is four feet two palms distant from
the second; each alternate one of these holes is made in the same direc
tion, and they are arranged at equal intervals. Each single cam must
be opposite another; the first is inserted into the upper part of the first
hole, the second into the lower part of the same hole, and so fixed by
pegs that they do not fall out; the third cam is inserted into that part
of the second hole which is on the right side, and the fourth into that
part on the left. In like manner all the cams are inserted into the consecutive
holes, for which reason it happens that the cams depress the levers of the
A—CHARCOAL. B—MORTAR-BOX. C—STAMPS.