OCR Text |
Show To Make Stones Stronger. Almost everybody knows tho rule of tho masons that Btono used In building Bhould bo bo placed thnt it will lio as it lay In its natural bed when quarried. Hut Francis W. Hoyt, In tho Engineering Nows, says that this familiar rule needs In many casoa to bo supplemented with other precau- tlons. Thoro aro threo plnnos of frac-turo frac-turo known to quarrymen. Tho "rift" Is tho direction In which tho atono splits most easily; the "grain" that which Is next easiest; the "head" that which offers tho greatest resistance. In a paving block tho two sides represent repre-sent tlio rift fracture, tho top and bottom tho grain and tbo ends the houd. Uut In a quarry tho natural bed Is sometimes conslrerably Inclined to tho piano of tho rqlft; honco tho Imperfection of tho ordlnnry rulo for placing the stono In building. |