| Beginning in 1872 the Navy categorized its ships in four rates, 1st through 4th, which were based on displacement tonnage. Analysis of the 2nd and 3rd Rates showed that both contained two lines of development, one larger and one smaller, and this totally unofficial subdivision is used here. The break for 2nd Rates was at around 2500 tons. |
| Note: These five ships were successors to three large sail spar-deck corvettes cut down from frigates (Cumberland and Macedonian razeed, Constellation "rebuilt"), which had their batteries on a single covered gun deck plus, in Cumberland, large pivoted shell guns on the ends of the spar deck. |
| Notes: The Wampanoags were described when ordered in 1863 with the Guerriere and Contoocook classes as "screw sloops of great speed" with the most powerful engines and "on which some sacrifice of armament has been made to obtain speed." In 1869-1870 Tennessee (renamed from Madawasca on 15 May 1869), was modified along lines recommended by a Navy board for the entire Wampanoag group: half of her boilers and two funnels were removed and a full ship rig was fitted. Her remaining boiler power proved insufficient to operate her original Ericsson engines, and in 1871-1875 John Roach under a controversial contract removed these and installed new compound engines and cylindrical boilers. As of February 1880 ships between 4000 and 4500 tons (of which only Tennessee was then active) were upgraded from the 2nd Rate to the 1st Rate. Tennessee is listed throughout in the port call tables as Second Rate, Large. |
| Note: These were initally described as "screw sloops with spar decks" and, when ordered in 1863, as "vessels with steam machinery of rather less power [than the Wampanoags], but ... much more heavily armed." In October and November 1863 twenty identical engines for this class and the smaller Contoocook class were ordered, and all twenty ships were named. Sixteen hulls were funded, twelve including eight Guerrieres were ordered, but only four Guerrieres and four Contoocooks were completed. The armament and beam of the Guerrieres were similar to those of the large 1857 sloops (Lancaster, etc.) but their length and displacement were greatly increased in an effort to reach higher speeds, and then increased more to augment the armament. The Guerrieres were designed with vertical bows but had clipper bows substituted during construction. Like other ships built during the Civil War, their unseasoned white oak and hackmatack hulls quickly deteriorated. |
| Note: Described as "clipper screw ships" and, when ordered in 1863, as vessels of "less size [than the Guerrieres] but with equal machinery and intended for greater speed." They were designed with vertical bows, but all received clipper bows during construction. Unlike the Guerrieres they were designed without spar decks, although two ships received them before completion. |
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USS Severn, ex Mosholu (1867-1877) North Atlantic Station, 1869-1871. She was completed without a spar deck as originally designed although quarter galleries were added. Photo No. NH 44959 Source: U.S. Naval History and Heritage Command |
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USS Worcester, ex Manitou (1866-1883) North Atlantic Station, 1871-1876. This ship was given a complete spar deck and quarter galleries before completion in 1871. She served as a receiving ship at Norfolk from 1877 to 1883. Photo No. NH 44958 Source: U.S. Naval History and Heritage Command |
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USS Congress, ex Pushmataha (1868-1883) North Atlantic and European Stations, 1871-1876. A spar deck was added during construction although she did not get quarter galleries. She is shown with the Venice waterfront in the background in 1874 or 1875. Photo No. 19-NC-4858 (NAID 353696453) Source: NARA RG-19 (also NH 61487) |
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USS Albany, ex Contoocook (1864-1872) North Atlantic Station, 1868-1870. In March 1864 Contoocook was assigned an armament of one pivoted 60-pdr Parrott rifle on a short forecastle, two 24-pdr howitzers and two 20-pdr bronze rifles on a poop, and eight 9" Dahlgrens in an open broadside battery without a spar deck. She was completed thus in 1868 but had another six 9" guns added to the battery in October 1869. This rigging plan of "Contoocook & Class" without a spar deck was produced at Washington, D.C. in March 1865 and used at the Portsmouth, N.H. Navy Yard and is presented here as merged from two NARA images. Download large copy here. Photo No. NAID 7368237 Source: NARA Boston (Waltham), RG-181 |
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| Note: Designed as an enlarged copy of Lancaster (1858) with similar lines, one-sixth more displacement, and an 8-foot ram. In turn a similar ram was added to Lancaster when that ship was completely rebuilt in 1879-80. |
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USS Trenton (1876-1889) European, Asiatic, and Pacific Stations, 1877-1889. Photo No. NH 299 Source: U.S. Naval History and Heritage Command |
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| Note: On 3 March 1885 Congress authorized "two cruisers of not less than 3,000 nor more than 5,000 tons displacement" (the 1st Rank Newark and Charleston). |