BLASTING

the most efficient mode of sr-| removing, or breaking up large ma es of rock in the operations of mining, quarryor, | ing, or engineering. The old method was ho | to bore a hole in the rock by means of of | suitable meget insert a charge of ed genpowder, in nee Cae See in| the remainder of the hole wi a he | stone, clay, etc., and then fire the sk by meats Of 6 Se ae The frst n- | great improvement on early method do | of tight packioy, and satety fuses for fring: 0 packing.: ne | and the risk of accidents has now been un | reduced to a minimum by the use of he | electric currents for that purpose. More d, | powerful explosives in the form of gunne | cotton, dynamite, and blasting-gelatine )e | are now used. st| BLAVATSKY, [s. 73]