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Show To Make Stones Stronger. Almost everybody knows tho ruls of tho masons that stono used In building should be so placed that It will He as It lay In Its natural bed whon quarried. But Francis W. Hoyt, In tho Engineering News, says that this familiar rule needs in many cases to bo supplemented with othor precautions. precau-tions. Thoro are three planes of fracture frac-ture known to qiiarrymcu. The "rift" Is tho direction In which thostono splits most easily; the "grain" that I which is next easiest; tho "head" that which offers tho greatest resistance. i In n paving block tho two sides represent repre-sent the rift fracturo, tho top and bottom tbo grain and tho cnd3 the head, But In a quarry tho natural bed Is sometimes conslrerably Inclined to tho plane of tho rqlft; hence the lmperfoctlon of tho ordinary rule for placing the stono In building. |