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Hole is bored with 1.5-in. auger to within 1 ft. of desired depth; then charge is inserted and tamped down with earth and fired by blasting cap and fuse.
Hole is bored with 1.5-in. auger to within 1 ft. of desired depth; then charge is inserted and tamped down with earth and fired by blasting cap and fuse.
Digging pole holes with dynamite
Telephone Engr
Van Druff, C.R. (Autor:in)
Telephone Engineer ; 21
1919
2 pages
4 Figs.
Aufsatz (Zeitschrift)
Englisch
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