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mrh' i&fs mm m safety rules must be rigidly oftserved. Ditching with dynamite should net be done ffmesS the sail is wet enough to support propogation fifing. tod cahndt get satisfactory r**tilts fit drjr, loose, of- Sandy sails, id gfavel or hard packed earth, pi id extreme muck Conditions;
An experienced blaster; after firing a test section, can usual* ly determine the weight and distribution of loadings for .the desired ditch in most soil conditions,
A dyhimited ditch, siys ffald,
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