| 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 each contained two lines of development, one larger and one smaller, and this totally unofficial subdivision is used here. The break for 3rd Rates was at around 1400 tons, with none below about 700 tons. |
| Note: These ships were officially earlier sloops of four different types "rebuilt" under a legal fiction that allowed the use of repair funds for new construction, respectively Swatara (1) (steam, 1865), Marion (sail, 1839), Quinnebaug (1) (steam, 1866), Galena (1) (former ironclad, 1861), and Mohican (1) (steam, 1859). Compared to Civil War cruising ships, the ones built in the 1870s had more beam in proportion to length to carry heavier broadside armaments and to stand up well under canvas on long cruises. |
| Note: This ship was officially the sailing sloop Vandalia of 1825 "rebuilt." |
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USS Vandalia (1874-1889) North Atlantic, European, and Pacific Stations, 1876-1889. Shown at the New York Navy Yard. Photo No. NH 58662 Source: U.S. Naval History and Heritage Command |
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| Note: On 3 March 1883 Congress authorized "one dispatch boat, as recommended by the Naval Advisory Board," (Dolphin) along with three cruisers (Atlanta, Boston, and Chicago). |
| Note: On 3 March 1885 Congress authorized "one heavily armed gunboat of about 1600 tons displacement" (Yorktown). On 3 March 1887 Congress authorized "two steel gunboats, each of about 1,700 tons displacement; of the type of gunboat number one" (Concord and Bennington). With Petrel they were an attempt to reach a minimum cruiser size consistent with seagoing efficiency and a heavy battery. They were similar to Dolphin in size but exceeded her in battery. |
| Note: On 7 September 1888 Congress authorized seven cruisers including "three gun-boats or cruisers, neither of which shall exceed 2,000 tons in displacement, ... to be built either wholly of steel or with steel frames" (Montgomery, Detroit, and Marblehead). The Navy set their designed speed at 18 knots, making them cruisers, before reducing it to 17 knots. Their partial protective deck was less than one inch thick, making their coal bunkers their primary protection. Like the larger Cincinnati class they were re-engined with less powerful machinery in 1900-02 and their armament was also reduced to help give them adequate stability. |