[Adapted from the 1914 edition of U.S. War Department Pamphlet No. 1866: Description of the Automatic Pistol, Caliber .45, Model of 1911, with Rules for Management, Memoranda of Trajectory, and Description of Ammunition, 1917 printing. It's available as a pdf and in other formats at The Internet Archive. The U.S. Army adopted the John Browning-designed Colt M1911 a century ago last month.]
