Blaster's Handbook - Softcover
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1922 Excerpt: ...but, unless rock is encountered. are loaded much lighter, the object being simply to blast enough to loosen the material, making the digging easy. DIGGING POST AND POLE HOLES Dynamite is useful in digging both shallow and deep holes for fence posts and for telephone and other classes of poles. First remove the soft sur face to a depth of from 6 to 8 inches, or down to the hard ground, and to the full diameter of the desired hole. This will 7 1 V / prove helpful even where there ' /, is but a few inches of soft ground. The hole is then ready for punching the bore hole-for loading. Shallow Holes--For shal.' low holes drill or punch a bore hole in the center of the shallow hole by a suitable method (page 59) to about the depth of the desired hole and load it with a small charge of Red Cross Extra 20%, primed with a blasting cap and fuse. A test shot will show whether the holes should be tamped or Fig. 99.--Method of loading to blast a shallow pole or post hole. The object is to loosen the soil so that it can be easily shoveled. not. Such a blast will so loosen the hard ground or shale as to make shoveling easy (Fig. 99). Deep H0les.--For deep holes the bore hole should be several inches deeper than the desired pole hole. The charge is prepared by cutting the dynamite cartridges into pieces from 1% to 4 inches long and tying them to a lath as is shown in Fig. 100, the extreme end piece being primed. The entire charge is lowered into the hole (Fig. 101), so that the primer is some 18 ins. to 20 ins. below the surface, and fired. The effect of the blast is to spring the soil back and form the hole. As the blast has affected the soil to its full depth the hole is deeper than needed. Fig. l00.--The size of each cartridge and distance apart on the stick Ire ch...
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- PublisherRareBooksClub.com
- Publication date2012
- ISBN 10 1236278143
- ISBN 13 9781236278142
- BindingPaperback
- Number of pages54
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