. Improving crop yields by the use of dynamite . are sometimes foundin land having a sandy top soil with a hard subsoil. In this case30 per cent, dynamite may give the best results. The chargeshould be placed under the middle of, and as close to the stump aspossible. Second-Growth Stumps There is often directly under a second-growth stump, thedecayed remains of the original stump; this is soft, and the force ofthe explosive when placed on it, seems to merely scatter this deadwood and has no marked effect upon the stump. To overcomethis difficulty, it is a good plan to dig under the stump and p
. Improving crop yields by the use of dynamite . are sometimes foundin land having a sandy top soil with a hard subsoil. In this case30 per cent, dynamite may give the best results. The chargeshould be placed under the middle of, and as close to the stump aspossible. Second-Growth Stumps There is often directly under a second-growth stump, thedecayed remains of the original stump; this is soft, and the force ofthe explosive when placed on it, seems to merely scatter this deadwood and has no marked effect upon the stump. To overcomethis difficulty, it is a good plan to dig under the stump and placea good-sized flat stone between the roots, leaving only room ontop of the stone for the dynamite. Damp clay should then befirmly packed around the dynamite. This gives the explosive suffi-cient resistance to lift out the stump. 30 or 40 per cent, dynamiteshould be used. It should be remembered that best results will behad from the explosives recommended for blasting the above stumps,if they are exploded with No. 6 or stronger detonators. 27. ^ ? CC ^CQ fl) < $ o ,, CLEARING THE LAND Western Fir, Pine and Cedar Stumps In the States of Washington, Oregon and California, wherethe rainfall is large and the ground in the forests is always damp,many of the trees grow to great size—some being eight or ten feetin diameter. The roots of these trees usually spread out near thesurface and do not grow deep into the ground, as might be expected,tap roots being extremely rare. The object when blasting thestumps of these trees is not to split them, but to bring them outentire at one blast, with all of the roots possible, because if thecharge of explosives is so gauged and located as to split the stump,it generally fails to bring out all of the pieces. As the principalobject is to get out as much of the stump as possible at a minimumcost, it is better to blast it out first and then it can be easily splitafterward, by means of a small quantity of dynamite exploded inauger holes. The co
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Keywords: ., bookcentury1900, bookdecade1910, bookidimp, booksubjectexplosives
