Hand book of Explosives for Farmers, Planters, Ranchers; How to Clear Land ..

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The proper place to locate the charge so that it will shatter a maximum area of subsoil, is two to three feet be- low the surface if the hardpan is thm, and the holes are placed four to eight feet apart. In thick hardpan with the holes fifteen to thirty feet apart, the charge should be located about a foot above the bottom of the hardpan.
In California, hardpan has been blasted very effectively and cheaply with Judson Powder R. R. P. (5 ^( ). A slow-acting dyna- mite does better work than a qui
...ck one, because its effect is more spreading. The difference in the results of the use of slow explosives and of quick ones on hardpan is illustrated on pages 74, 76 and 78.
The exact size of the charge, the proper spacing of the holes, and their depth, depend largely on the kind of subsoil to be broken, its thickness and depth below the surface.
When the bore holes are fifteen feet or more apart, it is best to explode a number of charges simultaneously by means of electricity, but when the bore holes are closer, it answers the purpose about as well to explode the charges with fuse and blasting caps.


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