A Handbook on Modern Explosives; Being a Practical Treatise on the Manufacture and Application of Dynamite, Gun-Cotton, Nitro-Glycerine, and Other Explosive Compounds, Including the Manufacture of Collodion-Cotton

A Handbook on Modern Explosives; Being a Practical Treatise on the Manufacture and Application of Dynamite, Gun-Cotton, Nitro-Glycerine, and Other Explosive Compounds, Including the Manufacture of Collodion-Cotton

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1890 edition. Excerpt: ...forge, and a small air-compressor to furnish air to the diver, as it is advisable to supply the divers with air from a separate compressor or receiver. I have had occasion to visit works of this description in the United States, and the plan usually adopted there is to erect over the rock to be blasted a stationary framing 20 to 30 ft. square, which is built of timber, and is easily dismounted, and the drills are mounted on this staging; they are worked by steam. The boiler is on a scow, which at the same time carries the dredger, and as the drills are worked by steam which is led to them in tubing, no air-compressor is required, except a small one to supply the divers. I have also seen a small stage from which two drills are worked, consisting of a large box made of i in. planks, 12 ft. square and 3 ft. high, air and water tight; this box was mounted within four posts, and when the holes were to be fired, by turning a crank, working a rack and pinion gear, the box was lowered on to the surface of the water and the four posts lifted out of position, so that the same became a floating stage, and could be moored back again after the firing of the blasts. Where the stationary stagings are large, 20 ft. square or more, the blasting can be carried out safely, without damaging the supports, and they are only shifted whenever the bore-holes become located too near the supporting posts. Machine Drills.--The drills are generally of a heavy pattern, at least 5 in. diameter by 8 in. stroke, and the drill steel ranges from 2 to 3 in. diameter, as long bars have to be used when there is any depth of water. Each drill works in a sliding frame, so that several feet in depth can be drilled without adding on fresh length of steel to the drill, or changing to...show more

Product details

  • Paperback | 134 pages
  • 189 x 246 x 7mm | 254g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236502175
  • 9781236502179