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Gunnery; An Elementary Treatise, Including a Graphical Exposition of Field Artillery Fire

Gunnery; An Elementary Treatise, Including a Graphical Exposition of Field Artillery Fire


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About the Book

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. 1912 Excerpt: ... its weight, which constantly tends to make it fall flat, and its energy of rotation, which keeps it vertical. When, owing to the friction of the peg of the top, the energy of rotation is sufficiently diminished, the top overbalances. Now, with a shell, the force tending to overturn it is the pressure due to the resistance of the air, and that tending to keep it straight is the rotation due to the rifling. The former tends to constantly diminish as the shell expends its velocity in overcoming the resistance of the air; but the spin is affected only by the surface-friction between the shell and the air, and reduces it to a less extent. For flat trajectories, it follows, then, that if we give the shell enough spin to keep it straight at starting, this will suffice to keep it point foremost to the end of its flight. Minimum Twist.--The longer the shell in proportion to its diameter the greater the amount of spin required. It will be afterwards seen that it is desirable not to allow an undue amount, as this increases the lateral curvature of the path of the shell. Uniform and Increasing Twist.--It will be readily understood that if a heavy shell has a high velocity of rotation suddenly forced upon it, this must cause a severe strain both on the shell and on the gun. To avoid this, the grooves of the rifling are made to run at first straight down the gun, gradually increasing in inclination or "pitch" till the full velocity of rotation is attained. This is known as an "increasing twist," in contradistinction to the older "uniform twist," in which the pitch of the rifling was the same all down the bore. The increasing twist, however, has the advantage of causing greater friction in the bore and consequent loss of velocity. For the in...


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Product Details
  • ISBN-13: 9781130783155
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 78
  • Spine Width: 4 mm
  • Width: 189 mm
  • ISBN-10: 1130783154
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 154 gr


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Gunnery; An Elementary Treatise, Including a Graphical Exposition of Field Artillery Fire
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