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Huntly Press and District Gazette, Volume 2, Issue 66, 28 November 1913, Page 2

1 he invention consists in the DESCRIPTION. PUceof what . . as detonator shield.” This is a ea ing with perforations to allow direct contact between ih» gases j caused bv (donation and the ex- j plosive used. Inside this casing j is placed a detonator, ami at a distance of a quarter to half inch from its base, a knot is made ; on tiie wires. This knot, when 1 drawn taut against the base of | the shield, prevents any strain I applied to the wires being trans- j mitted to the internal composi- \ tion, and, in addition, makes it j impossible for the wires and de- . tonator to become detached or se- ■ paratedfrom one another. There j is, moreover, an alternative j method of attaching the wires to j the shield which does not re- i quire a knot. The shield also f nrotects the detonators from friction or shock when inserting or withdrawing. The appliance for inserting the shields and detonators,and suitably stemming the hole to permit of withdrawal, consists of a length of copper tube, graduated on the outside, for measuring the depth of the hole. This is provided with a suitable handle and an internal copper rod with a loose spike at one end, and locking .arrangements at the other, for securing the various parts, which together form a complete tool with its own special use. The inventors, Messrs Price and THE CLAIMS Claim ‘ hat OF THE thls new system INVENTORS. ma ß.l Sh L t fi .r US and the handling of detonators absolutely safe, and casualties impossible; that the dangerous and costly process of drilling another hole alongside in case of misfire is done away with ; that no time is wasted in searching for unexploded detonators ; and that with the adoption of the system there will he no loss of time or output by misfires. It will ho impossible for any person other than the appointed shot-firer to charge or stem a shot-hole. If, after charging a number of holes in a district in a mine, the examiner finds that the conditions for shot-firing are unfavourable the detonators can be removed with perfect safety, and re-instated when conditions are normal. The inventors, who have proceeded on entirely new lines, have invented appliances and a system of using, these appliances whereby misfires, given a perfect detonator, become impossible; but should mis-fires occur through faulty detonators or connections, the detonator can be, from a place of safety, immediately withdrawn from the shot-hole, the leads being connected to the firing cables in a

suitable manner for so doing. After withdrawal, the hole can be approached, and a fresh j detonator inserted, the whole j operation taking no more than three minutes ; or, if preferred, the detonator may be withdrawn, and the hole left until next day, when a fresh detonator may be inserted. For the past year the two inventors have been 1 engaged in demonstrating the uses of their appliances up and down the country at gatherings of officials and working miners, in every case completely satisfying their audiences, failure being recorded in no single case.