By R.K. [Ken] House
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Extra info for Blasters Training Manual for Farmers, Ranchers, Prospectors, Engineers, Small Construction Contractors
And so on. one from each of the first and last charges. These are then connected to the leading wires or firing lines, which are in turn connected to the power source. In cases where the distance between the caps is greater than can be spanned by the leg-wires, connecting wire must be used to join the caps. However, electric blasting caps may be purchased with long leg-wires and it is much better to use caps with longer leg-wires than to use connecting wire. The use of connecting wire increases the number of wire connections or splices, the total resistance of the circuit, and the chances of error.
Unlike the fuse blasting cap, the electric cap has no open end. It is completely sealed with water-resistant plugs and compounds, with only two insulated "Leg-Wires" emerging. Caps are available with leg wires from about four feet to about one hundred feet in length. Inside the cap, the leg wires are joined by a short piece of a fine resistance wire called a "Bridge-Wire", which is imbedded in an ignition mixture. When an ample electric current passes through this bridge- 55 wire it heats it to incandescence.
Or pushing the "Charge" button. He/she will not fire, however, until he/she is sure in his/her own mind that everything is in order. and short circuit the leading wires at the blasting machine end. NOTES:- 59 Making Primer Cartridges for Electric Firing In a previous chapter you learned the general guidelines for making primer cartridges. These also apply to primers made for electric firing. Many of the principles and techniques described in material dealing with making primer cartridges for fuse firing also apply to making electric primers and will not be repeated.
Blasters Training Manual for Farmers, Ranchers, Prospectors, Engineers, Small Construction Contractors by R.K. [Ken] House