Du Pont farmer's handbook; instructions in the use of dynamite for clearing land, planting and cultivating trees, drainage, ditching and subsoiling . eet indiameter require a little greater charge for their size than do thelarger stumps, and the rule with them is to use as many pounds ofJudson Powder R. R. P. as eight times the largest diameter in this basis a stump six feet in diameter would need about forty-eight pounds of powder. However, the successful blasting of theselarge stumps depends greatly on the judgment of the blaster, andthese rules can only be considered as a general gu
Du Pont farmer's handbook; instructions in the use of dynamite for clearing land, planting and cultivating trees, drainage, ditching and subsoiling . eet indiameter require a little greater charge for their size than do thelarger stumps, and the rule with them is to use as many pounds ofJudson Powder R. R. P. as eight times the largest diameter in this basis a stump six feet in diameter would need about forty-eight pounds of powder. However, the successful blasting of theselarge stumps depends greatly on the judgment of the blaster, andthese rules can only be considered as a general guide. This caneasily be understood when it is remembered that, owing to differencein soil or some peculiarity in the growth of the tree, it sometimes re-quires the same quantity of explosives to properly bring out a stumpsix feet in diameter as it does another one eight feet in diameter. In blasting these stumps a trench is dug large enough to permitplacing the entire charge of explosives directly underneath the centerof the stump. A little dynamite blasted in holes punched with acrowbar will prove of great assistance in digging this trench. 36. 5 o ?5 E jj ra E 5 E o o 5 BLASTING OUT STUMPS If the ground is wet, the charge should be placed in waterproofbags, as Judson Powder R. R. P. is not waterproof and is quicklydamaged by water. Judson Powder R. R. P. can be properly exploded only witha primer of 40/f (or stronger) dynamite. The sizes of the primersrequired for different charges of Judson Powder R. R. P. are asfollows: Charge of Judson Powder Primer of 40, Dynamite Pounds Number of 1 4 x 8 Cartridges 10 1 20 2 50 4 300 25 When several cartridges are used as a primer, they should betied in a compact bundle with a primed cartridge in the center. Ifblasting cap and fuse are used in the priming cartridge, care shouldbe taken in placing the primer to prevent any contact between thefuse and the Judson Powder R. R. P., as the latter is very inflam-mable. The charge should be firml
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