Du Pont farmer's handbook; instructions in the use of dynamite for clearing land, planting and cultivating trees, drainage, ditching and subsoiling . ncipal object is to get out as much of thestump as possible at a minimum cost, it is better to blast it out firstand then it can be easily split afterwards, by means of a smallquantity of dynamite exploded in auger holes. The common rule in blasting these stumps is to use one andone-half pounds of Hercules Powder-Stumping L. F. per foot ofdiameter, with stumps up to four feet, when the subsoil is larger sizes two to two and one-half poun
Du Pont farmer's handbook; instructions in the use of dynamite for clearing land, planting and cultivating trees, drainage, ditching and subsoiling . ncipal object is to get out as much of thestump as possible at a minimum cost, it is better to blast it out firstand then it can be easily split afterwards, by means of a smallquantity of dynamite exploded in auger holes. The common rule in blasting these stumps is to use one andone-half pounds of Hercules Powder-Stumping L. F. per foot ofdiameter, with stumps up to four feet, when the subsoil is larger sizes two to two and one-half pounds for each foot indiameter should be used. Stumps in gravelly or loose ground requireone pound more for each foot in diameter. The charge of explosives is best placed when there is sixteento twenty-four inches of earth between it and the bottom of thestump. This results in the force of the explosion radiating to allsides, lifting the stump clear of the ground, and bringing with it thegreatest length of roots. If the charge is placed too close to thestump, the effect is to split it, leaving the roots to be dug out at extralabor and expense. 34. o 5 V) O n) re 5 » J: o •D ?1- £.= » 5 - £ BLASTING OUT STUMPS When these stumps are large the bottom of the bore hole is sprung or chambered until it is so large that the increased chargerequired can be concentrated under the center of the stump. Thechambering is done by exploding, without tamping, first a half car-tridge, then several successive charges of from one to five cartridgeseach, in the bottom of the bore hole. When the hole is large enoughit is given time to cool off and is then charged with the necessaryquantity of Hercules Powder-Stumping L. F. to bring out the pages I 1-16, and 31 for proper methods of priming, charging,tamping and firing. Redwood and Bigtree Stumps The best explosive for these stumps is Hercules Powder-Stump-ing L. F. or Judson Powder R. R. P. The latter is comparativelyslow-acting and has
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