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Dahlgren guns were muzzle-loading naval gun designed by a United States Navy Rear Admiral John A. Dahlgren (November 13, 1809 – July 12, 1870), mostly used in the American Civil War. Dahlgren's design philosophy evolved from an accidental explosion in 1849 of a 32 lb (14.5 kg) gun being tested for accuracy, killing a gunner.
After his father's death, he would write and present many technical papers on military weaponry, including the Dahlgren gun. Ulric Dahlgren (1842–1864) was a soldier in the Union Army and was killed in an unsuccessful mission to liberate Federal prisoners in Libby Prison and Belle Isle.
The gun was first tested at the Dahlgren proving grounds in 1927, with tests continuing into the 1930s. It fired a 2,100 lb (953 kg) AP shell at 3,000 ft/s (914 m/s) muzzle velocity, with a range of 49,383 yd (45,156 m) at 40° elevation.
The Dahlgren gun was the standard weapon of the United States Navy. These smoothbore guns were also referred to as "shellguns" as they were designed to fire massive exploding shells. These smoothbore guns were also referred to as "shellguns" as they were designed to fire massive exploding shells.
Dahlgren gun, type of smooth bore cannon designed by the Admiral and used by the U.S. Navy; Dahlgren Affair, failed mission to assassinate leaders of the Confederacy; Dahlgren system and dahlgrenogram, created by Swedish-Danish botanist Rolf M. T. Dahlgren (1932–1987) USS Dahlgren (TB-9), Torpedo Boat No. 9/TB-9/Coast Torpedo Boat No. 4
A 24-pounder is a gun firing a shot of 24 pounds weight, a mass of 11 kg. Examples include: 24-pounder long gun, including various designs of artillery used during the Age of Sail; M1841 24-pounder howitzer, used by the United States Army from 1841 to 1865; A size of Dahlgren gun used during the American Civil War
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The US Navy Ordnance Department under Rear Admiral John A. Dahlgren awarded Wiard a contract to produce two 15 in (381 mm) rifled guns of about the same weight as the smoothbore XV-inch (381 mm) Dahlgren shell gun. Wiard was to be paid $10,750 in 1860s money for each gun. The result was probably one of the most complex guns ever cast in one piece.