Amphitrite-class monitor

	USS Monadnock, a monitor of the Amphitrite class, crossing the Pacific Ocean during the Spanish–American War.
Class overview
Builders	Continental Iron Works (Greenpoint, NY); Harlan & Hollingsworth; John Roach & Sons; Phineas Burgess; William Cramp & Sons;
Operators	United States Navy
Succeeded by	Puritan class
In commission	1891–1919
Planned	5
Completed	4
Scrapped	4
General characteristics
Type	Monitor
Displacement	3,990 long tons (4,050 t) (designed)
Length	262 ft (80 m) oa; 259 ft (79 m) lwl;
Beam	55 ft 6 in (16.92 m)
Draft	14 ft 6 in (4.42 m)
Installed power	4 × single-ended steam boilers; 1,426 ihp (1,063 kW) (produced on trials);
Propulsion	2 × Triple expansion (Monadnock); 2 × Compound (Others);
Speed	12 kn (22 km/h; 14 mph) (designed); Monadnock: 11.5 kn (21.3 km/h; 13.2 mph); Others: 10.5 kn (19.4 km/h; 12.1 mph);
Range	1,370 nmi (2,540 km; 1,580 mi) @ 10 knots (19 km/h; 12 mph)
Complement	19 officers and 164 enlisted
Armament	4 × 10 in (250 mm)/30 caliber guns; 4 × 6-pounder 57 mm (2.2 in) guns; 2 × 3-pounder guns; Various smaller;
Armor	Iron armor; Belt: 7–5 in (180–130 mm); Deck: 1.75 in (44 mm); Turrets: 11.5 in (290 mm);

The Amphitrite-class monitors were a class of four U.S. Navy monitors ordered in the aftermath of the Virginius affair with Spain in 1873. The four ships of the class included Amphitrite, Monadnock, Terror, and Miantonomoh. A fifth ship originally of the same design, Puritan, was later fitted with extra armor and designated as a unique class.

Puritan and the Amphitrite class were to remain under construction for an extraordinarily long period due both to design changes and to the reluctance of the US Congress to appropriate funds for their completion. Most of the vessels were only commissioned in the mid-1890s—more than twenty years after the commencement of construction. They were eventually to see active service in the Spanish–American War.

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