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| Keywords: 240mmTrenchMortarCartridge100.jpg Cross-sectional view of cartridge case for 240 mm 9 45 inch Trench Mortar as adopted by the US Army 1918 <br> Cartridge case Brass 9 776 inches long x 6 67 inches diameter flanged at base <br> Percussion cap contains percussion composition H42 mixture 21 97 flowers of sulphur; 30 83 sulphide of antimony; 47 20 chlorate of potash Based on diagram in Manual for Trench Artillery Part IV 240 mm Mortar United States Army March 1918 Reprinted July 1918 <br>War Department Document No 820 A E F 519 Office of the Adjutant General <br>http //cgsc cdmhost com/u /p4013coll9 252 2007-09-08 Rcbutcher PD-USGov See Also 240 mm 9 45 inch Mortar Breech Mechanism December 1917 240 mm 9 45 inch Trench Mortar Detailed Firing Mechanism diagram March 1918 240 mm Trench Mortar 1910s technical drawings 240 mm Trench Mortar World War I mortar ammunition 240 mm Ballistite Cartridge cases 240 mm Trench Mortar | ||||
