Technical Paper Volume 180-189

Technical Paper Volume 180-189

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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. 1917 edition. Excerpt: ... photograph shows a flame is less than 5 millimeters high, notify the explosives engineer before averaging; otherwise average regardless of variation. SMALL IMPACT TEST. The small impact machine is used in the determination of the relative sensitiveness of explosives to explosion, as indicated by the blow of a known mass of steel dropped from varying heights. In each trial the charge of explosive used is 0.02 gram, to be taken from the middle of an original cartridge. After the charge has been weighed on a chemical balance, the charge is wrapped in tinfoil and placed in a desiccator (containing no desiccating material). The charge as used is transferred from the tinfoil onto an anvil and spread out in the form of a flat disk having a diameter of 1 centimeter. The lower face of the plunger has a diameter of 1 centimeter. Previous to a trial the plunger is lowered and gently pressed upon the explosive. Trials are made by dropping the weight from known elevations. The following records are required: The weight of the plunger to the nearest gram, which must weigh 900 25 grams. The weight used is 2,0005 grams. The temperature of the room should always be given to the nearest degree centigrade, and the water circulating through the anvil should always be at 25 2 C. The height of the fall given to the nearest centimeter. The result of every trial should be either: No explosion, slight explosion, or sharp explosion. The trials when recorded on the test record sheets should be given in the same order as on the test cards, which is the order in which they are made. The number of trials required is at least six. The maximum height is established by five "no explosion" trials at a height 1 centimeter below a point at...show more

Product details

  • Paperback | 90 pages
  • 189 x 246 x 5mm | 177g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236942051
  • 9781236942050