Show vie U ue of limo into in blast ing there are some saine forbes apparently ly insignificant which act with ir resistible es tible power through short afa t bancea once the expansion of waltr in freezing is a forea of k kiad i md the in bulb wit hi in Aran from the liquid to of ice is only about one it exercises a powerful significance in breaking iron ven ves eleand renting the hardest rocks it ever every y one who lias has slacked a lump of quicklime quick liseby lime by gra gradually duall pouring water upon n it lia has observed that thy i first ne effect et of the contact bet between n the water and the lime is to muse a swelling ew elling of the lump it generally expanded and taked up considerably more inore foont than before this expansive force lias has recently been successfully applied to coal mining in england powdered quicklime in strongly compressed into ato cartridges about theft ruches inches in diameter and each has run running if in through it ft a perforated iron tu tube be trough which water can call be lie forced cartridges cartridge a were used in a coal mine in place of the tile usual blasting charge water waa was forced into them and the expansion of the lime threw down a MAN of f coal weighing about 10 tons wit with 11 ll little of tile small coal emi made with the usual blast tho the exemption from danger and the avoidance of smoke have caused coal mine owners to regard this new method with favor our ingenious genious readers may way find a useful in hint in this alfr t in eri I call J full aart |