. Improving crop yields by the use of dynamite . en the charge and the bottomof the stump. This results in the force of the explosion radiatingto all sides, lifting the stump clear of the ground, and bringing withit the greatest length of roots. If the charge is placed too closeto the stump, the effect is to split it, leaving the roots to be dug outat extra labor and expense. It is advisable with large stumps tochamber, or expand, the bottom of the hole, so that the entire chargecan be concentrated under the center of the stump. To dothis a hole is bored beneath the stump by means of a dirt au
. Improving crop yields by the use of dynamite . en the charge and the bottomof the stump. This results in the force of the explosion radiatingto all sides, lifting the stump clear of the ground, and bringing withit the greatest length of roots. If the charge is placed too closeto the stump, the effect is to split it, leaving the roots to be dug outat extra labor and expense. It is advisable with large stumps tochamber, or expand, the bottom of the hole, so that the entire chargecan be concentrated under the center of the stump. To dothis a hole is bored beneath the stump by means of a dirt augeror small post-hole auger. In this hole a small charge is usuallyexploded with fuse and blasting cap and no tamping is used. Thequantity of explosives to be used in chambering, depends, of courseon the size of the charge necessary to blast out the stump. Usuallyfrom half a cartridge to two cartridges of stumping powder willbe sufficient. After the hole is chambered the blasting charge shouldbe loaded in the usual way and thoroughly tamped. 29. 5 S ao3 a < 0! S -I i o CO (0 £ IS? CL -n -c3 ni 10 0.(0c - m 0)E~© +. s: 3+< o w c -I--. o » ° -»-o CLEARING THE LAND Redwood and *Bigtree Stumps The best explosive for these stumps is a comparatively slow-acting explosive, which has more of a lifting and heaving, than ashattering effect. The way to approximately estimate the quantity of explosivenecessary to blast out stumps larger than eight feet in diameter, isto square the largest diameter in feet, the result being approximatelythe number of pounds required. For example, if a stump is eightfeet in diameter the largest way, the charge should be about sixty-four pounds. Stumps less than eight feet in diameter require alittle greater charge for their size than do the larger stumps, andthe rule with them is to use as many pounds as eight times the largestdiameter in feet. On this basis a stump six feet in diameter wouldneed about forty-eight pounds of powder. However, the su
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Keywords: ., bookcentury1900, bookdecade1910, bookidimp, booksubjectexplosives
