US Army 8-Inch Seacoast Howitzers, Pattern 1840, at Castillo de San Marcos
Two US Army 8-Inch Seacoast Howitzers, Pattern 1840, are the two largest cannons displayed among the 19th Century US cannons along the water battery at the Castillo de San Marcos National Monument. The two seacoast howitzers were made by Columbia Foundry in 1841.
The 8-Inch Siege Howitzer of USS Pawnee
Two 8-Inch Siege Howitzers, Model 1841 (Olmstead et. al say "Pattern 1840") at the Washington Navy Yard.
Both were used in an attempted ambush of USS Marblehead on the Stono River on Christmas Day, 1863. One was subsequently carried as a pet aboard USS Pawnee.