Du Pont farmer's handbook; instructions in the use of dynamite for clearing land, planting and cultivating trees, drainage, ditching and subsoiling . es should be longenough to let it float six or eight feet below the holes. The explosionof all of these charges simultaneously by the operation of the blastingmachine, will break up the first fifty or sixty feet of the channel and thebroken ice will immediately float away unless the current of the streamis very sluggish. In that case the broken ice should be pushed out withpoles into open water before it has time to freeze in place sam
Du Pont farmer's handbook; instructions in the use of dynamite for clearing land, planting and cultivating trees, drainage, ditching and subsoiling . es should be longenough to let it float six or eight feet below the holes. The explosionof all of these charges simultaneously by the operation of the blastingmachine, will break up the first fifty or sixty feet of the channel and thebroken ice will immediately float away unless the current of the streamis very sluggish. In that case the broken ice should be pushed out withpoles into open water before it has time to freeze in place same operation is repeated, cutting out fifty or sixty feet or moreof the channel with each blast until the gorge has been cut through. Ifthe ice is from two to four feet thick the charge in each hole should befrom two to five I Y4 x 8-inch cartridges of Red Cross 40% Dyna-mite. In ice six to eight feet thick, each charge must be increased toten or twelve cartridges. When the ice is thick, and large charges arenecessary, the holes have to be from six to twelve inches in diameterin order to get the bundle of cartridges through them. These large 64. STARTING L O G JAMS holes can be cut through the ice more easily by exploding half car-tridges of the dynamite in small holes made with bars. In this work particular attention should be given to having thedynamite li a well-thawed and soft condition when it is used. Ice is blasted from watering places for stock either by explodingthe dynamite on the ice or in the water under the ice. See pagesII to 1 5 for proper methods of priming, charging, tamping and firing. STARTING LOG JAMS To start log jams with dynamite the charge of several cartridgesor in some instances of many pounds of dynamite is exploded on orunder the logs forming the key of the jam. If smaller charges areenough, the cartridges are tied in a bundle as when blasting ice. Ifcharges of fifty pounds or more are necessary the dynamite may be putin a bag or left in the original
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