. Clearing land of rocks for agricultural and other purposes. Explosives in agriculture; Clearing of land. A Sti'^ight ser-ies connecf'On for US& with b/asting machine £ Dii/i'ding into ti/vo Circuits to reduce ' used with b'asting machi, C Multiple -Series used with both blasting machine and power-current Method of wrapping wires together to make electrical joint, and of taping joint. connections require current from an electric light or power plant. If your work is such that the charges cannot be connected in series or that parallel connections are desirable, it is well to co
. Clearing land of rocks for agricultural and other purposes. Explosives in agriculture; Clearing of land. A Sti'^ight ser-ies connecf'On for US& with b/asting machine £ Dii/i'ding into ti/vo Circuits to reduce ' used with b'asting machi, C Multiple -Series used with both blasting machine and power-current Method of wrapping wires together to make electrical joint, and of taping joint. connections require current from an electric light or power plant. If your work is such that the charges cannot be connected in series or that parallel connections are desirable, it is well to communicate with an expert or authority on electricity for special sugges- tions and advice as to how best to fire your charges. In a bulletin of this size it is impossible to give a comprehen- sive statement of Current electric firing. But Required to give some idea, it can be stated that an electric blasting cap re- quires 1 to 13^ amperes to insure firing. This amount of current will fire one cap or many in a series. To force this amount of current through the wires requires a certain voltage, the amount de- pending on the size and length of all the wires, and on the joints. One bad or poorly wrapped joint will increase the resistance of the circuit more than several caps. The voltage of the current re- quired to fire any circuit usually can be computed by an expert when the details of the wiring system are explained to him. When charges are connected in parallel, instead of series, or in multiple series (see diagram C), each circuit requires 1 to 13^ amperes of current. That is, each cap requires 1 to 1}^ amperes when connected in parallel. The voltage required, of course, de- pends on the resistance of the wires. A very much greater cur- rent than of 1 to 13^ amperes will do no harm; in fact it is desirable. Electric blasting machines are constructed to give a suffi- cient amperage and voltage for Ways of connecUng up charges for electric firing. 54. E Three wire system wit
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectexplosi, bookyear1918
