|70-pounder Whitworth gun|
Gun from Princess Royal, in Willard Park at the Washington Navy Yard
|Place of origin||United Kingdom|
|Used by||Confederate States, United States, Brazil|
|Wars||American Civil War, Paraguayan War|
|Weight||8,582 pounds (3,892.7 kg)|
|Length||118 inches (2.997 m)|
|Shell|| Solid shot|
|Shell weight||81 pounds (36.7 kg)|
|Calibre||5.5-inch (140 mm)|
|Maximum range||5,540 yards (5,070 m)|
|Filling weight||3 pounds 12 ounces (1.7 kg)|
Four guns were captured by the United States Navy on the blockade-runner Princess Royal on 29 January 1863. Two were sent to Morris Island, Charleston, South Carolina to bombard Fort Sumter during the summer of 1863. One gun had a premature detonation that killed four of its crew when trying to ram a projectile home. Another gun was disabled after 111 shots when its inner tube moved back far enough to block the vent.
- Gratz, George A. (1999). "The Brazilian Imperial Navy Ironclads, 1865–1874". In Preston, Antony. Warship 1999-2000. London: Conway Maritime Press. ISBN 0-85177-724-4.
- Alexander Lyman Holley, "A Treatise on Ordnance and Armor" published by D. Van Nostrand, New York, 1865
- Olmstead, Edwin; Stark, Wayne E.; Tucker, Spencer C. (1997). The Big Guns: Civil War Siege, Seacoast, and Naval Cannon. Alexandria Bay, New York: Museum Restoration Service. ISBN 0-88855-012-X.
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