Mobile Artillery Targets, Accessories, and Smoke-bomb Outfits: February 27, 1908, Revised June 25, 1909, Revised April 2, 1910, Revised June 1, 1914, Revised July 14, 1916 (Google eBook)

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U.S. Government Printing Office, 1917 - Targets (Shooting) - 23 pages
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Page 13 - ... repeated. After punching, 1.5 grains of slow-burning powder composition and 9.3 grains of smokeless powder is poured into each of the holes, with the aid of the measures and funnel. The slow-burning powder composition is poured in first. A wooden plug is then- driven into each hole with the hammer until the top of the plug is flush with the top of the headplate. If any of the wooden plugs are hard to drive in, due to swelling from being exposed to moisture, they should not be driven in so far.

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