A—MORTAR. B—UPRIGHT POSTS. C—CROSS-BEAMS. D—STAMPS.
E—THEIR HEADS.
F—AXLE (CAM-SHAFT). G—TOOTH OF THE STAMP (TAPPET). H—TEETH OF AXLE (CAMS).
can remove with a shovel the fine sand, and likewise the coarse sand and
broken rock, into which the rocks have been crushed; this board can be
lowered, so that the mouth thus being closed, the fresh rock thrown in may
be crushed with the iron-shod stamps. If an oak block is not available,
two timbers are placed on the ground and joined together with iron clamps,
each of the timbers being six feet long, a foot wide, and a foot and a half thick.
Such depth as should be allowed to the mortar, is obtained by cutting out the
first beam to a width of three-quarters of a foot and to a length of two and a
third and one twenty-fourth of a foot. In the bottom of the part thus dug
out, there should be laid a very hard rock, a foot thick and three-quarters of a
foot wide; about it, if any space remains, earth or sand should be filled in
and pounded. On the front, this bed rock is covered with a plank; this
rock when it has been broken, should be taken away and replaced by
another. A smaller mortar having room for only three stamps may also be
made in the same manner.
F—AXLE (CAM-SHAFT). G—TOOTH OF THE STAMP (TAPPET). H—TEETH OF AXLE (CAMS).
can remove with a shovel the fine sand, and likewise the coarse sand and
broken rock, into which the rocks have been crushed; this board can be
lowered, so that the mouth thus being closed, the fresh rock thrown in may
be crushed with the iron-shod stamps. If an oak block is not available,
two timbers are placed on the ground and joined together with iron clamps,
each of the timbers being six feet long, a foot wide, and a foot and a half thick.
Such depth as should be allowed to the mortar, is obtained by cutting out the
first beam to a width of three-quarters of a foot and to a length of two and a
third and one twenty-fourth of a foot. In the bottom of the part thus dug
out, there should be laid a very hard rock, a foot thick and three-quarters of a
foot wide; about it, if any space remains, earth or sand should be filled in
and pounded. On the front, this bed rock is covered with a plank; this
rock when it has been broken, should be taken away and replaced by
another. A smaller mortar having room for only three stamps may also be
made in the same manner.
The stamp-stems are made of small square timbers nine feet long and
half a foot wide each way. The iron head of each is made in the following
half a foot wide each way. The iron head of each is made in the following