Emerald-class corvette

The Emerald-class corvettes were a class of six composite screw corvettes built for the Royal Navy in the mid-1870s. The Opal was built by contract under the 1873-74 Programme, and Turquoise, Ruby, Tourmaline and Emerald under the 1874-75 Programme - the first three also by contract, while Emerald was dockyard-built at Pembroke. The final ship (Garnet) was also dockyard-built at Chatham under the 1875-76 Programme.

Turquoise at anchor
Class overview
Name: Emerald class
Operators:  Royal Navy
Preceded by: HMS Rover
Succeeded by: Bacchante class
Built: 1873–1878
Completed: 6
Scrapped: 6
General characteristics (as built)
Type: Composite screw corvette
Tonnage: 1,864 bm
Displacement: 2,120 long tons (2,150 t)
Length: 220 ft (67.1 m) (p/p)
Beam: 40 ft (12.2 m)
Draught: 18 ft (5.5 m)
Installed power: 2,031–2,364 ihp (1,515–1,763 kW)
Propulsion:
Sail plan: Ship rig
Speed: 12–13 knots (22–24 km/h; 14–15 mph)
Range: 2,000–2,280 nmi (3,700–4,220 km; 2,300–2,620 mi) at 10 knots (19 km/h; 12 mph)
Complement: 230
Armament:

Design and construction

The construction used iron frames, with wooden cladding around the frames. These were two-decked ships, with the ordnance on the upper deck and accommodation on the main deck below. They were designed to carry the same armament of fourteen 64-pdr guns as the preceding Amethyst class corvettes from which their design was developed, with two of the guns mounted on rotating slides as bow and stern chasers, and the other twelve guns slide-mounted on the broadsides.

However, only Opal was so completed, and two of her broadside guns were removed following her first commission. Tourmaline was built with the same number of ports, but with only ten broadside guns vice twelve (plus the two chase guns). The other four vessels were completed with this ordnance (two chasers and ten broadside guns, without ports for a sixth pair of broadside guns) - all these guns being of the 64cwt model. In the early 1880s Tourmaline and Emerald were re-armed with four 6-inch (100-pdr) and eight 5-inch (50-pdr) breach-loader guns.

Ships
Ship Builder[1] Laid down[2] Launched[2] Completed[2] Fate[2] Cost[2]
Opal William Doxford, Sunderland 13 October 1873 9 March 1875 January 1876 Sold for scrap, 11 August 1892 £95,949
Turquoise Earle's Shipbuilding, Hull 8 July 1874 22 April 1876 13 September 1876 Sold for scrap, 24 September 1892 £95,547
Ruby Earle's Shipbuilding, Hull 8 July 1874 9 August 1876 14 June 1877 Converted to coal hulk, December 1904; sold for scrap, 16 February 1921 £93,116
Tourmaline Raylton Dixon, Middlesbrough 17 July 1874 30 October 1875 January 1874 Converted to coal hulk, 1899; sold for scrap, November 1920 £95,769
Emerald Pembroke Dockyard 29 July 1874 18 August 1876 2 July 1878 Converted to powder hulk, 1898; sold for scrap, 10 July 1906 £98,442
Garnet Chatham Dockyard 16 March 1875 30 June 1877 31 October 1878 Sold for scrap, December 1904 £92,468

Notes

    Footnotes
    1. Chesneau & Kolesnik, p. 51
    2. Lyon & Winfield, p. 289

    Bibliography
    • Ballard, G. A. (1937). "British Corvettes of 1875: The Six Composite Corvettes". Mariner's Mirror. Cambridge, UK: Society for Nautical Research. 23 (April): 176–89.
    • Chesneau, Roger; Kolesnik, Eugene M., eds. (1979). Conway's All the World's Fighting Ships 1860–1905. Greenwich, UK: Conway Maritime Press. ISBN 0-8317-0302-4.
    • Winfield, R.; Lyon, D. (2004). The Sail and Steam Navy List: All the Ships of the Royal Navy 1815–1889. London: Chatham Publishing. ISBN 978-1-86176-032-6.
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