Blasters Training Manual for Farmers, Ranchers, Prospectors, by R.K. [Ken] House

By R.K. [Ken] House

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Example text

However, under no circumstances should you ever slit or mutilate the wrapper or shell of a primer cartridge! Such a practice can cause the cap to become forced from the protection of the cartridge during loading. It is the base of the blasting cap which explodes with the greatest violence, and the maximum shock wave travels down the primer cartridge in the direction the base of the cap is pointing. Therefore, the method of priming which is selected should be such that when the primer is positioned in the charge, the base of the cap will be pointing toward the main charge of explosives.

Wires. a] Leading Wire:- Sometimes called "Firing Wire" or "Shooting Lines", which connects the power source to the blasting circuit. This should This should be a two conductor solid copper wire, well insulated not less than 14 gauge, and at least 250 feet in length for small blasts and much longer for large blasts. b] Connecting Wire is a smaller, solid copper single conductor insulated wire used to connect individual charges which are too far apart to be connected by simply joining the leg-wires on the caps.

Other necessary equipment includes wire-cutters and pliers, electrician's or plastic tape and a dynamite punch. Blasting Galvanometers and voltammeters are especially designed for testing blasting circuits. They contain special limiting resistors, and are powered by special batteries. may result in sufficient currents to accidentally fire the charge while testing the circuit! Accordingly, never try to improvise a circuit tester. Use only those instruments and replacement batteries and parts which have been specifically for testing blasting circuits.

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