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 40
labor to rediice them to the desired sizes and shape. Moreover, theexplosion of a single, large charge of powder, is likely to produce ashattering which can be wholly done away with if the charge is dis-tributed along a line among several holes which are exploded simul- MAKYLAXD GKOLOGICAL SUKVEY… … Fig. 7.—lugersoU-Sergeant steam drill. the drill attached to the piston. The machine is held in place bymeans of heavy weights on the legs of the tripod. The steam being (3 THE BUILDING AND DECOBATIVE STONES conveyed from the boiler to llie drill by means of a ilcxil)le hose,which allows the use of…
Stone · Building stones
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