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|Operators:||United States Navy|
|Preceded by:||Canonicus class|
|Succeeded by:||USS Dictator|
|Subclasses:||Agamenticus, Miantonomah, Tonawanda|
|Displacement:||3,400 long tons (3,455 t)|
|Length:||258 ft 6 in (78.8 m)|
|Beam:||52 ft 9 in (16.1 m)|
|Draft:||12 ft 8 in (3.9 m)|
|Installed power:||4 Martin boilers
1,400 ihp (1,000 kW)
2–4 steam engines
|Speed:||9–10 knots (17–19 km/h; 10–12 mph)|
|Armament:||2 × 2 - 15 in (380 mm) smoothbore Dahlgren guns|
|Armor:||Side: 4.5 in (114 mm)
Gun turrets: 11 in (279 mm)
Deck: 1.5 in (38 mm)
Pilothouse: 8 in (203 mm)
The ships of this class were designed by the Bureau of Construction and Repair, and were wooden-hulled. The Monadnock, the only one to take part in the Civil War, is usually considered the best of the U.S. monitors. In 1865/6 she went to San Francisco, via the Strait of Magellan and although three ships were in company, she was not towed.
Miantonomoh crossed the Atlantic in 1866, though she was towed for 1,100 miles by the side-wheel steamer Augusta. She returned in 1867 after a cruise of 17,767 miles. Two other ships, the Agamenticus and the Tonawanda were renamed Terror and Amphitrite respectively, on 15 June 1869.
The hull was of normal form without the Ericsson overhang, and freeboard is given as 2 feet 7 inches. The armor was made up of 1 inch plates and there were pilothouses on both turrets, with armored bases to the funnel and a large ventilation shaft abaft it. A light hurricane deck was rigged between the turrets.
- Canney, Donald L. (1993). The Old Steam Navy: The Ironclads, 1842–1885 2. Annapolis, Maryland: Naval Institute Press. ISBN 0-87021-586-8.
- Gibbons, Tony (1989). Warships and Naval Battles of the Civil War. New York: Gallery Books. ISBN 0-8317-9301-5.
- 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.
- Silverstone, Paul H. (2006). Civil War Navies 1855-1883. The U.S. Navy Warship Series. New York: Routledge. ISBN 0-415-97870-X.
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