. De re metallica. Metallurgy; Mineral industries. BOOK A—Mortar. B—Upright posts, C—Cross-beams. D—Stamps. E—Their heads. F —.4xLE (cam-shaft). G—Tooth of the stamp (tappet). H—Teeth of axle (cams). can remove with a shovel the fine sand, and hkewise 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 s
. De re metallica. Metallurgy; Mineral industries. BOOK A—Mortar. B—Upright posts, C—Cross-beams. D—Stamps. E—Their heads. F —.4xLE (cam-shaft). G—Tooth of the stamp (tappet). H—Teeth of axle (cams). can remove with a shovel the fine sand, and hkewise 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 '•ock 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. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Agricola, Georg, 1494-1555; Hoover, Herbert, 1874-1964. New York, Dover Publications
Size: 1547px × 1616px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthoragricolageorg14941555, bookcentury1900, booksubjectmin
