HMS Tourmaline (1875)
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Tourmaline in 1876 | |
| History | |
|---|---|
| Name | HMS Tourmaline |
| Namesake | Tourmaline |
| Builder | Raylton Dixon, Middlesbrough |
| Laid down | 17 July 1874 |
| Launched | 30 October 1875 |
| Completed | October 1876 |
| Fate | Sold to be broken up, November 1920 |
| General characteristics (as built) | |
| Class & type | Emerald-class corvette |
| Displacement | 2,120 long tons (2,150 t) |
| Length | 220 ft (67 m) pp |
| Beam | 40 ft (12 m) |
| Draught | 18 ft (5.5 m) |
| Installed power | 2,000 ihp (1,500 kW) |
| Propulsion |
|
| Sail plan | Full-rigged ship (barque from the 1880s) |
| Complement | 230 |
| Armament | 12 × 64-pounder RML guns |
HMS Tourmaline was an Emerald-class composite screw corvette that served in the Victorian Royal Navy. The Emerald class was a development of the wooden Amethyst class but combined an iron frame and teak cladding. Launched in 1875, Tourmaline was deployed to the North America and West Indies Station in 1878. The ship joined the third flying squadron in 1880, sailing to South Africa at time of the First Boer War and then to Australia, Japan, Singapore and Egypt, arriving in Alexandria in time to participate in the Anglo-Egyptian War. During 1883, the corvette was stationed in Zanzibar and then, in response to the Franco-Hova Wars, was the senior officer's ship in Madagascar. Following an armament upgrade, the vessel returned to the North America and West Indies Station in 1886. Converted to a coal hulk in 1899, Tourmaline was sold in 1920 to be broken up.
The Emerald class was a class of composite screw corvettes designed by Nathaniel Barnaby for the Royal Navy. The ships were a development of the preceding Amethyst class that replaced wooden construction with one that combined frames and keels of wrought iron, a stem and stern post of cast iron and a cladding of teak. The additional longitudinal strength of the metal frames was designed to afford the opportunity to build in finer lines, and thus higher speeds. The ships did not deliver this better performance, partly due to poor underwater design, and also were prone to oscillate in heavy weather.[1] In service, however, they proved to be good sailing vessels in all sorts of weather.[2][3] The ships were later redefined as third-class cruisers.[4]
The corvette had a length between perpendiculars of 220 ft (67 m), with a beam of 40 ft (12 m) and draught of 18 ft (5.5 m). Displacement was 2,120 long tons (2,150 t).[5] The engines were provided by Hawthorn.[6] The ship was equipped with six cylindrical boilers feeding a compound engine consisting of two cylinders, working on low and high pressure respectively, rated at 2,000 indicated horsepower (1,500 kW). The engines drove a single shaft, to give a design speed of 13.2 knots (24.4 km/h; 15.2 mph). The vessel achieved 12.62 knots (23.37 km/h; 14.52 mph) from 1,972 indicated horsepower (1,471 kW). Range for the class varied between 2,000 and 2,280 nautical miles (3,700 and 4,220 km; 2,300 and 2,620 mi) at 10 knots (19 km/h; 12 mph). The steam engines used in the class were troublesome, and the one in Tourmaline was so far from satisfactory that the chief engineer committed suicide. The engine was complemented by 18,250 sq ft (1,695 m2) of sail, which was ship-rigged.[1] This proved difficult to handle as it meant the vessel was too responsive to weather.[3] Between 1880 and 1890, this was altered to a barque rig.[1]
Tourmaline had an armament consisting of 12 slide-mounted 64-pounder rifled muzzle-loading (RML) guns. Five were mounted to each side to provide a broadside, the remainder being fitted in pairs firing through embrasures at the ends of the ship.[1] The guns were provided by the Ordinance Department at Chatham Dockyard.[7] Between 31 August 1884 and 10 August 1885, the armament was upgraded to four 6 in (150 mm) 100 pounder breech loading (BL) guns mounted behind shields and a broadside of eight 5 in (130 mm) 50 pounder BL guns.[8][9][10] The ship had a complement of 230 officers and ratings.[1]
