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 43
eel wedge. When the wedges or plugs are all in place tiie workman 74 THE BUILDING AND DECORATIVE STONES n strikes them one after the other with his haiumer, driving- them allalike, thus produeing a uniform strain along the line, until theblock falls apart. The method is commonly known as plug… … i-Hi. 10. — luLiorseill-SeliiX-ant chauiielliiiu liiachilif. inserted which are then driven with heavv striking hammers orsledges, in the same manner as before. Blasting by means of powder furnishes the only aAuilahle meansfor quarrying rocks of the granitic type, owing to their hardness.But the…
Stone · Building stones
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