HYDRAULIC DEVICE
HLOWING UP ROCKS. A writer in a German technical pp.per describes a hydraulic device for blowing up rocks, and, in particular, demolishing bridges, piles 'and ferro concrete foundaiotns. Jt Is based on the principle of the hydraulic press; enormous pressures are set up within the rock, which eventually bursts. The pressure Is transmitted by a pipe-line to a cylinder 85 millimetres in diameter, in I which eight pistons may be successively displaced telescopically. The cylinder is inserted into a hole drilled by an electric drill in the rock to be blown up. The pistons bury themselves in the rock one after the other and blow up the rocks. The holes Lake 10 or 15 minutes to drill (they are about 2.5 centimetres deep), and in five minutes after the rock is shattered. It is said that this device lias proved successful in mines and quarries where the use of explosives would be dangerous.
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Pukekohe & Waiuku Times, Volume 9, Issue 524, 20 April 1920, Page 2
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155HYDRAULIC DEVICE Pukekohe & Waiuku Times, Volume 9, Issue 524, 20 April 1920, Page 2
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