Engineering and Contracting . I/i , Number of Cartridges Required JIudcaDplng. SnakeholinK. • Blockhollng. :; 1 Vi :! 1 .4 4 H4 % Dont attempt 4 % Dont attempt 6 1 cartridge and packed firmly into the bottom of the small hole is made in this firmly pressed dynamite witha sharp stick, and in this is inserted a blasting cap andfuse. The hole is then tamped full of moist earth. Careshould be taken to have this tamping material packed veryfirmly (see Fig. 1). The gases caused by the explosionare so perfectly confined bj- this method that excellentresults may be secured with a comparatively
Engineering and Contracting . I/i , Number of Cartridges Required JIudcaDplng. SnakeholinK. • Blockhollng. :; 1 Vi :! 1 .4 4 H4 % Dont attempt 4 % Dont attempt 6 1 cartridge and packed firmly into the bottom of the small hole is made in this firmly pressed dynamite witha sharp stick, and in this is inserted a blasting cap andfuse. The hole is then tamped full of moist earth. Careshould be taken to have this tamping material packed veryfirmly (see Fig. 1). The gases caused by the explosionare so perfectly confined bj- this method that excellentresults may be secured with a comparatively small amountof a low strength dynamite. A glance at the accompany-ing Table I shows that it requires only about one-eighthas much dynamite to break a boulder this way as it wouldto break it by mudcapping. In breaking a boulder by the snakehole process, a holeis punched down with a bar directly under but along sideof the boulder (see Fig. 2). The hole should be puncheddeep enough so that the charge of dynamite will rest di-. PROrERLV HOLE \RGE
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisherchicago, bookyear19
