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 44
cks of the granitic type, owing to their hardness.But the method should be used reasonalily and with discretion.Material from a quarry where, as one sometimes reads, hundreds oreven thousands of tons of stone have been loosened by a single blast, JIARYLAXD GEOLOGICAI, SfKVEY 75 should always be… … Fig. 11.—Kcvolvins drum and hoist for derrick.(Forntshed by American Hoist and Derrick Co.. St. Paul. Minn.) In quarrying softerrocks like the sandstones, limestones and mar-bles, channelling machines are now used in nearly all American quar-ries. Two distinct types of these machines are used…
Stone · Building stones
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