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 42
cases wherebottom joints are not sufficiently developed, or are at too great a dis- Stones for Building and Decoration, 3nd Ed., p. 241. .MAKYI.AM) liKOLOGICM. SIRVKV 73 tance apart, it is soiiietiiucs necessary to resmt In drilling and blastingto free the rock from the quarry bed. Once loosened… … Fic. 1.—Warchvell oliaiiuellimr machine. IidIcs, niit over an inch in diaiiKter and a few inches deep, is drilledalong the line where it is desired the stone shall break. Into eachof these is then placed two half round wedge-shaped pieces of softiron, the thicker ends downward, and between them is…
Stone · Building stones
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