Canonicus-class monitor
Ship Builder Namesake Renamed Laid down Launched Commissioned or completed ( * )
Ajax Snowden & Mason , Pittsburgh , Pennsylvania Manayunk , Philadelphia Manayunk , 1862 ; Ajax , 15 June 1869 1862 18 December 1864 27 September 1865*
Canonicus Harrison Loring , Boston , Massachusetts Canonicus Scylla , 15 June 1869 ; Canonicus , 10 August 1869 1862 1 August 1863 16 April 1864
Catawba Alexander Swift & Company , Cincinnati , Ohio Catawba River Atahualpa 1862 13 April 1864 10 June 1865*
Mahopac Secor & Co. , Jersey City , New Jersey Lake Mahopac Castor , 15 June 1869 ; Mahopac , 10 August 1869 1862 17 May 1864 22 September 1864
Manhattan Perine , Secor & Co. , Jersey City , New Jersey Manhattan Indians Neptune , 15 June 1869 ; Manhattan , 10 August 1869 1862 14 October 1863 6 June 1864
Oneota Alexander Swift & Company , Cincinnati , Ohio Oneota Tribe of the Sioux Indians Manco Cápac 1862 21 May 1864 10 June 1865*
Saugus Harlan & Hollingsworth , Wilmington , Delaware Saugus , Massachusetts Centaur , 15 June 1869 ; Saugus , 10 August 1869 1862 8 February 1864 27 August 1864
Tecumseh Charles Secor & Co. , Jersey City , New Jersey Tecumseh Not Applicable 1862 12 September 1863 19 April 1864
Wyandotte Miles Greenwood , Cincinnati , Ohio Wyandotte Tribe Tippecanoe , 1869 ; Wyandotte , 10 August 1869 22 September 1862 22 December 1864 15 February 1866*
Ships
The Canonicus-class monitor was a class of nine monitors built for the Union Navy during the American Civil War. They saw service in the Civil War and the Spanish-American War, although two of them were never commissioned. They were basically improved s, modified in accordance with war experience. The four ships not commissioned during the war were built on the Ohio River, three at Cincinnati and Manayunk as far up as South Pittsburgh. The hull lines were improved and designed speed is given as but there was no hope of getting near this. The side armour was backed by two iron stringers deep and thick for from the bows, but elsewhere, and the armour lower edge was . The turret, of internal diameter, had plates as did the pilot house above, and the funnel base was also armoured. The turret skirt was protected by a thick and high ring fixed to the deck, and as in other later monitors the 15 in guns were longer than in the Passaic class and fired with their muzzles outside the turret. Tecumseh was sunk in Mobile Bay by a mine that exploded under her turret, and went down in 25-30 seconds. Canonicus, the last survivor, was finally decommissioned 31 years before being sold.