The Microscopy of Small Arms Primers

The Microscopy of Small Arms Primers

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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. 1922 edition. Excerpt: ...wooden plug inserted into the cup to hold the pellet and its covering in place. A tiny brass or antimony-lead alloy plug may be turned on a lathe so that the tiny, slightly conical cylinder will just fit into the primer cup and will be of such length that when the primer is clamped in the hand vise, the Fig. I. Fig. 2. Fig. 3. Fig. 4. Figs. 5 and 6. are introduced to illustrate the diIferences in behavior ot different primers under the same blows. F ig. 7. Fig. 8. _ PLATE XIV "Cocked" anvil and ruptured pellet. Section through a primer across the vents. This photograph is introduced to demonstrate the feasibility of cutting a primer in this plane. and further illustrates a type of abnormality consisting of a pellet much thicker on one side than on the other. Primer deterioration due to moisture present in the pellet when the primer was seated in the cartridge. Section through the primer of a German 7.9 mm. Mauser cartridge of 1918. These primers have a Berdan-type anvil (sec Fil!-4. Plale I")Textile fibres caught between anvil and cup and extending under the point of the anvil. Primer which detonated without the combustion or destruction of its paper disk. above, observing the same precautions. If this is done, it will be found that the primer can be satisfactorily sectioned with little danger of disturbing the pellet or its covering. The author prefers to cut the metal plug in half before inserting it in the primer. This avoids the "pinch gng" o3 the saw blade by the loosened half just as the saw cuts through. These half cylinders may e use repeatedly. Primers that are covered with tin foil require very great care as the saw approaches the foil, in order to avoid tearing it entirely off the pellet, or so bending...show more

Product details

  • Paperback | 24 pages
  • 189 x 246 x 1mm | 64g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236855949
  • 9781236855947