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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 41

An illustration from The building and decorative stones of Maryland, containing an account of their properties and distribution, 1898, leaf 41
of a ilcxil)le hose,which allows the use of the drill in any part of the (jiiariy. A differ-ent form of drill answering the same purpose is shown in Fig. S. Bymeans of these machines a series of two or more holes are drilled alongthe line where it is desired the stone shall break. These are… … Fio -lugersoll-Sergeaut quarry bar drill. of jar, the aim of the quarrier always being not to move the blockany appreciable distance, but simply to free it, after which it is re-duced to blocks of the required size by hand implements, to be notedlater. Where the bottom joints in a quaiTy are well…

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