Congressional Edition Volume 3485

Congressional Edition Volume 3485

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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. 1897 edition. Excerpt: ...with a fixed composition, I endeavored by varying the thickness of a flat grain about three-eighths of an inch square to adapt it to the field gun. The best results obtainable were 32,000 pounds pressure for the standard velocity of 1,450 feet per second. I then had the same material made in the form of a 7-perforated cylindrical grain, and got at the first trial 1,450 feet per second with 26,500 pounds pressure. The "progressiveness" of these forms, as defined in my report in the Eeport of the Chief of Ordnance for 1895, is about 0.6 and 1.2, respectively. From the method of combustion by parallel surfaces and the low velocity of such combustion it results that at least one of the dimensions of the grain of smokeless powder must be small. If, then, the powder be made in solid grains of a generally cubical or spherical form, they will be so small as to hinder the inflammation of the charge, and so give rise to irregular velocities and abnormal pressures. The most obvious method of obviating this difficulty is to make the powder in the form of rods or strips, which is a very usual form and very favorable to regular inflammation. But, then, this form is less progressive than the multiperforated cylinder, and as by increasing the number of perforations a grain of any desired size may be obtained for any given thickness of the walls between the perforations, it would seem that by this method a free and unhindered inflammation of the charge could be obtained and at the same time a considerable increase of ballistic power realized. More over, this form is a strong one and resists breakage or crushing better than the strip form, and consequently tends to regularity of results. All things considered, the perforated cylinder or more

Product details

  • Paperback | 146 pages
  • 189 x 246 x 8mm | 272g
  • United States
  • English
  • black & white illustrations
  • 1236800206
  • 9781236800206