. Better farming with Atlas farm powder, the safest explosive, the original farm powder. Explosives in agriculture. Better Farming with Atlas Farm Powder to the stone and not some distance down in the ground, and that the powder is not strung out in the hole. In many cases holes made with bar or auger should be enlarged at the bot- tom so the powder can be compressed into a more or less round bulk. This can be done with a scraper such as is shown on page 40, or in cases where the charge is very large, by springing the hole as suggested on page 47. Springing, however, opens cracks in the ground
. Better farming with Atlas farm powder, the safest explosive, the original farm powder. Explosives in agriculture. Better Farming with Atlas Farm Powder to the stone and not some distance down in the ground, and that the powder is not strung out in the hole. In many cases holes made with bar or auger should be enlarged at the bot- tom so the powder can be compressed into a more or less round bulk. This can be done with a scraper such as is shown on page 40, or in cases where the charge is very large, by springing the hole as suggested on page 47. Springing, however, opens cracks in the ground which are detrimental to the confine- ment oi the main powder charge, hence is recommended only for emergency use. Several sticks of powder strung out end to end in a long hole will not give good breakage unless they are under a long stone, and lie parallel to its Half-buried rocks often can be "blockholed" to good advantage. Unless the hole contains water at the time the loading is done, the paper wrap- pings of the sticks should be slit so that a little pressure from the tamping rod will make the powder break out and take the shape of the hole. It then should be tamped gently but firmly—pressed rather than pounded—and so that no air spaces remain. Priming should be done as usual (see page 8). The cap or electric tuze should be inserted in at least half a stick of powder and tied to it. This primed powder should go into the hole last— on top of the rest of the powder. Tamping should be done carefully. The hole should be filled to the top with solidly packed dirt. Dry, light earth or dust makes poor tamping material. The best is stiflF damp clay. Other soil may be used, however, when clay is not handy A shovel is not necessary when loose dirt for tamping can be found close to the holes. 68 The Powder to use for undermine blasting of boulders is the same as that for mudcapping—Atlas Powder 50 per cent. Any less violent powder will not give as good res
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectexplosi, bookyear1919
