Cement and Engineering News Volume 25

Cement and Engineering News Volume 25

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1913 edition. Excerpt: ...of no value. The third property of this "ideal" explosive is its plasticity. Gelatins are physically similar somewhat to well-worked putty, and can be molded, sliced and worked into seams and fissures in the rock and expanded by means of a suitable tamping stick to fill all the cracks and crevices, excluding air spaces and increasing the effective force of the explosive accordingly. "It stays where it is ut." p A new Gelatin has lately appeared upon the market having all the desirable features of its well-known predecessors, but having the additional virtue of a very low freezing point. It is just as plastic, dense, water-proof and reliable as former Gelatin explosives. It is no more difiicult to explode and is just as agreeable to handle. The freezing point of all nitroglycerine explosives is never exactly fixed, but varies somewhat with physical conditions. The new Gelatin which is known as Du Pont Gelatin, will not freeze above 32 F., while it has been known to withstand temperatures below zero for several weeks without freezing, although such extreme resistance to cold is not expected of it. In ordinary quarry work, a Gelatin which will withstand ice-cold water without freezing is about all the most exacting quarryman can ask. At the quarry of the Lee Lime Company, Lee..Iass., a blast was made recently using this Du Pont Gelatin in a ledge of dolomite. This rock is used for making a high-rade chemical lime, and is all hand picked for the kiTns. There were 21 holes in the ledge, 16 feet deep, about six feet apart, having an average burdn of 11 feet. ' Everyone of these holes contained water. From 23 to Z7 cartridges of 1%x8-inch Du Pont Gelatin were used for each hole. It took about two hours to load and fire...show more

Product details

  • Paperback | 230 pages
  • 189 x 246 x 12mm | 417g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236980859
  • 9781236980854