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A further display of tho merits of tho new explosive, “ rackarock,” was made this afternoon at the Logan Point quarry. Two chambers had been blown out with dynamite, one chamber being 14ft long by 3ft wide and the other a little longer. Into these drives was placed a quantity of the explosive—3slb in all—and as soon as the 2.30 train had passed the fuses were fired, the spectators having ample time to retreat out of harm’s way. The first explosion did not make a great deal of noise, but the second shook the ground for a radius of, perhaps, a quarter of a mile, and when those present gathered on the spot that five minutes previously had been a vertical face of solid stone, they found the whole hillside shattered, and the appearance of the place completely altered. A shelf sloping back to about 20ft high was blown down, and a section of the face removed, while new seams appeared in the rock overhead, and so far as could be seen the blasts had riven the stone to the bottom, thus creating a new face when the debris is cleared away. Experts on the ground estimated that nearly 2,000 tons of stuff had been won by the two blasts. It was observable that none of the stuff was blown out of the quarry ; indeed, to all appearances the spectators would have been unharmed if they had remained on the road. Mr Palmer, who has had considerable experience of explosives in this quarry, expresses the opinion that the rackarock is superior to dynamite, in that it is more expansive, and all present seemed to be of one mind as to tho merits of tho explosive. Mr B. A. M‘Arthur, who is introducing the rackarock to New Zealand, should he well satisfied with his afternoon’s work.

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Bibliographic details

THE NEW EXPLOSIVE., Issue 8050, 29 October 1889

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THE NEW EXPLOSIVE. Issue 8050, 29 October 1889

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