The building and decorative stones of Maryland, containing an account of their properties and distribution (1898)
Merrill, George P. (George Perkins), 1854-1929, Mathews, Edward Bennett, b. 1869 · Baltimore, Johns Hopkins press · leaf 45
t types of these machines are used (Figs. 9 and 10), 76 THE BUILDING AXD DECORATIVE STONES but with both the results are essentially the same. The machines areconstructed to run forward and backward over temporary tracks laidon the quarry floor and to cut as they go straight smooth channelsinto the… … Fui. V: -Lincoln stone jilaner. blocks which need only to be freed from the quarry bed to becomeavailable. This freeing from the bed is usually done by means ofmachines known as undercutting or gadding machines. Theseare sometimes ordinary impact steam drills, or again diamond drills.In either ease…
Stone · Building stones
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