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For the 8-inch siege mortar at a range of 800 yards, about 50% of the shells would fall within a 50-yard radius of the target. With the 10-inch siege mortars at 875 yards, about 60% of the shells would fall within a 40-yard radius of the target. The 13-inch seacoast mortar could be expected to be more accurate. (Abbot 1867, p. 39)
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10-inch seacoast mortar M. 1841 United States: 1841 260: 26 cm Minenwerfer M 17 Austria-Hungary: World War I 320: 320 mm Type 98 mortar Japan: World War II: 325: Mortier de 12 Gribeauval Kingdom of France: 1781 330: 13-inch seacoast mortar M. 1861 United States: 1861 914: Little David United States: World War II: 914: Mallet's Mortar United ...
These heavy guns were intended to be mounted in seacoast fortifications. 8-inch, 10-inch, 13-inch, 15-inch, and 20-inch bore (20, 25, 33, 38, and 51 cm) Rodman guns were produced. Other than size, the guns were all nearly identical in design, with a curving bottle shape, a large flat cascabels , and ratchets or sockets for the elevating mechanism.
She was used for various purposes, but, especially for bombardment because of her large 13-inch mortar that could fire up and over tall riverbanks. 13 Inch Mortar Racer was purchased for $7500 by the Navy at New York City 29 August 1861; and commissioned at the New York Navy Yard 21 January, Acting Master Alvin Phinney in command.
one 13-inch (33 cm) mortar two 12-pounder rifled howitzers USS Maria J. Carlton was a schooner acquired by the United States Navy on October 15, 1861, during the American Civil War .
USS T. A. Ward was a 284-ton schooner was purchased by the Union Navy during the Union blockade of the Confederate States of America during the American Civil War.. T. A. Ward was initially assigned by the Union Navy for blockade duty in the ports and waterways of the Confederate States of America; however, because of a change in Union strategy, she was redesignated a mortar gunboat, and ...
USS John Griffith was a mortar schooner acquired by the Union Navy during the American Civil War.She was used for various purposes, but especially for bombardment because of her large 13-inch mortar and 12-pounder howitzers that could fire up and over tall defensive riverbanks.