. Better farming with Atlas farm powder, the safest explosive, the original farm powder. Explosives in agriculture. The cap of mud should be 6 inches thick, and should extend 6 inches or more beyond the powder all round. should be of mud, not dry dirt. It should extend at least 6 inches over the rock in all directions from the edges of the powder, hence usually will have to be 18 or 20 inches wide. Clay makes the best mudcap, though other earth will answer. To get it of the proper con- sistency, dry dirt may be mixed with water in a dishpan or box. The pan or box saves some trouble in getting
. Better farming with Atlas farm powder, the safest explosive, the original farm powder. Explosives in agriculture. The cap of mud should be 6 inches thick, and should extend 6 inches or more beyond the powder all round. should be of mud, not dry dirt. It should extend at least 6 inches over the rock in all directions from the edges of the powder, hence usually will have to be 18 or 20 inches wide. Clay makes the best mudcap, though other earth will answer. To get it of the proper con- sistency, dry dirt may be mixed with water in a dishpan or box. The pan or box saves some trouble in getting the mud in place, as it may be inverted and emptied over the powder charge. The blaster should make sure that there is at least 6 inches over the powder. More will be even better, while less will cut down the effectiveness of the blast. Once in place, the mud should be packed well with a shovel. No stones should be permitted to get into the mudcap, for they will fly like bullets. Powder. The powder to use tor mudcapping is Atlas Powder 50 per cent. The violence of this explosive is suited for the purpose, and will ac- complish the maximum of breakage with the minimum of charge. Atlas Farm Powder may be used, but excessive charges are required owing to the fact that its force is applied more slowly and escapes by lifting the mudcap be- fore the rock breaks. When there is opportunity to buy powder especially for mudcapping, the more violent grade should be insisted on. The amount of powder per charge is indicated in the table following: Minimum Thickness of Stone. Sticks of Powder. 18 inches 2 2 feet 3 2i feet 5 3 feet 7 4 feet 12 5 feet 18 Regarding this table, however, we hasten to remark that the charge in each case must depend on the stone. A boulder of trap rock, for instance, will require about three times the charge a boulder of sandstone takes. The kind ot breakage desired also has a bearing, since a lighter charge will crack it into three or four large pieces, while. Som
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectexplosi, bookyear1919
