. Improving crop yields by the use of dynamite . n the sides of the wooden plugs large enough for the twosmall wires to run through it, if the cap of the electric squib is putin place before the plug is driven in. When driving the plug caremust be taken that the wires are kept free, and that the insulationon them is not abraded. If it is not convenient to provide woodenplugs in this work, damp clay tamping may be used on top of a wadof newspaper. A log two feet in diameter, and four or five feetlong, can usually be split in two with one two-ounce charge of FFblasting powder, fired as described
. Improving crop yields by the use of dynamite . n the sides of the wooden plugs large enough for the twosmall wires to run through it, if the cap of the electric squib is putin place before the plug is driven in. When driving the plug caremust be taken that the wires are kept free, and that the insulationon them is not abraded. If it is not convenient to provide woodenplugs in this work, damp clay tamping may be used on top of a wadof newspaper. A log two feet in diameter, and four or five feetlong, can usually be split in two with one two-ounce charge of FFblasting powder, fired as described above. Longer logs require twoor more holes, and logs of greater diameter require heavier holes should be from one and one-eighth to two inches indiameter. Logs up to six feet in length can be split at once into a numberof pieces, by exploding a single charge of low-grade dynamitein a hole bored about twelve or fourteen inches straight into thecenter of one end. Two ounces is about the right charge for alog two feet in diameter. 37. BOULDER BLASTING J^HP^ ■ 1 THE BOULDER — BEFORE THE BLAST TPHERE are three ways in which boulders can be blasted.■^ These are known as **Mudcapping/ Snakeholing andBlockholing. **Mudcapping* and *Snakeholing are theeasier and quicker methods, but require more dynamite. It isalmost impossible to shatter large round boulders of hard rock byeither of these methods, without using an excessive quantity of ex-plosives, which makes blockholing necessary with boulders of thiskind. Mudcapping (Doby Shooting or Blistering) Boulders may frequently be broken by exploding a smallcharge of dynamite on their surface. The charge should be placedon the spot which would be struck with a sledge if the boulder wasto be broken in that way. The dynamite should be packed in a solidmass by slitting the paper cartridge shells, but should not be spreadover the surface of the boulder any more than absolutely blasting cap crimped on to fuse shoul
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Keywords: ., bookcentury1900, bookdecade1910, bookidimp, booksubjectexplosives
