Interior Ballistics; A Text Book for the Use of Student Officers at the U.S. Artillery School

Interior Ballistics; A Text Book for the Use of Student Officers at the U.S. Artillery School

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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. 1894 edition. Excerpt: ... the higher is the energy realized. The same effect, unless modified by other circumstances, is produced when the charge is increased w1th the same weight of projectile. In this case the projectile has to traverse a greater length of bore before the same relief due to expansion is obtained. The higher pressures which consequently rule, react upon the rate of combustion of the powder, and again a somewhat higher energy is obtained.1 1 Interior Ballistics. By Colonel Pashkitvitsch. Translated from the Russian by Captain Taster H. Bliss, U. S. Army. Washington, 1892.' Observed pressures in the Bores of Guns There are two methods for determining experimentally the tension of the gas at various points in the bore of a gun, both of which have been tried more or less successfully. The first method measures the tensions by means of suitable gauges inserted at different points in the walls of the bore. This method was first employed by Rodman as stated in Chapter I. By the second method the velocity of the projectile is measured at different points of the bore, and from these measured velocities the accelerations are calculated, and then the pressures, by multiplying the accelerations by the mass of the projectile. Two methods of determining these velocities have been devised: First, that employed in 1760 by Chevalier D'Arcy, an account of which is given in Chapter I. Second, Nobles method, which consists in measuring the time at which the projectile passes certain fixed points in the bore, and thence deducing the corresponding velocities. Noble's Chronoscope.--The almost infinitesimal intervals of time required for the second method are determined by means of a chronoscope invented by Captain Noble which is thus described:2 "In its more

Product details

  • Paperback | 40 pages
  • 189 x 246 x 2mm | 91g
  • United States
  • English
  • black & white illustrations
  • 1236789016
  • 9781236789013