P000095.jpg (800 × 573 pixels, file size: 173 KB, MIME type: image/jpeg)
Locharbriggs Quarry. Dumfriesshire. A close-up showing the 'shot-grove' and chisel wedge method of splitting stone. Widely spaced holes are drilled and filled with black powder; once blown and the blocks dislodged, chisel wedges are driven in along planes of weakness (usually bedding planes) to further work the stone. Note the quarryman wielding the large crowbar. The Locharbriggs Sandstone Formation is of Permian age.
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|current||14:00, 12 April 2015||800 × 573 (173 KB)||Scotfot||Locharbriggs Quarry. Dumfriesshire. A close-up showing the 'shot-grove' and chisel wedge method of splitting stone. Widely spaced holes are drilled and filled with black powder; once blown and the blocks dislodged, chisel wedges are driven in along pla...|