French ironclad Jemmapes
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Jemmapes in 1895 | |
| History | |
|---|---|
| Name | Jemmapes |
| Ordered | 18 December 1889 |
| Builder | Ateliers et Chantiers de la Loire, Saint-Nazaire and Saint-Denis |
| Laid down | 26 December 1889 |
| Launched | 27 April 1892 |
| Commissioned | 4 March 1895 |
| Decommissioned | 22 March 1910 |
| Stricken | 3 August 1910 |
| Fate | Sold to be broken up 5 November 1927 |
| General characteristics | |
| Class & type | Jemmapes-class coastal defense ship |
| Displacement | 6,579 t (6,475 long tons) (deep load) |
| Length | 89.6 m (294 ft 0 in) (o/a) |
| Beam | 17.48 m (57 ft 4 in) |
| Draft | 6.71 m (22.0 ft) |
| Installed power |
|
| Propulsion | 2 shafts, 2 triple-expansion steam engines |
| Speed | 15 kn (28 km/h; 17 mph) |
| Range | 2,667 nmi (4,939 km; 3,069 mi) at 11 kn (20 km/h; 13 mph) |
| Complement | 299 |
| Armament |
|
| Armor |
|
Jemmapes was the lead ship of a class of two coastal defense ships built for the French Navy (Marine Nationale) in the 1890s. Launched in 1892, the vessel joined the Northern Squadron of the French Navy (Esadre du Nord) at Brest. Armed with a main armament of two 340 mm (13.4 in) guns, the vessel was designed within the principles of the Jeune École. The ship initially joined the Northern Squadron, which was called, "the most homogenous and dangerous squadron that one could meet at sea". In 1902, the vessel was subject to underway replenishment when coal was transferred from the bunkers of other battleships during a naval exercise with the Mediterranean Squadron. Jemmapes also took part in large naval exercises in 1895 and 1900 but otherwise had an uneventful career as French naval doctrine moved from a fleet of smaller coastal defense ships to larger ocean-going battleships. The ship was decommissioned in 1910 and served as a hulk before being sold in 1927 to be broken up.

A larger and more capable design based on the French ironclad Furieux launched in 1883, Jemmapes was the lead ship of a class of two coastal defense ships designed by Louis de Bussy for the French Navy (Marine Nationale) as part of a wider adoption of the principles of Jeune École. The design was to have a similar level of armament, armour, draught and fuel storage as the preceding design but with a more modern powerplant based on Belleville boilers that would provide an increase in speed to 16 kn (30 km/h; 18 mph). The design proposal was accepted by the Board of Construction (Conseil de travaux) on 26 February 1889, finalised on 2 July and approved by the Minister of the Navy (Ministère de la Marine) Jules François Émile Krantz on 6 July.[1]
Jemmapes had an overall length of 89.6 m (294 ft 0 in), 89.35 m (293 ft 2 in) at the waterline and 86.535 m (283 ft 10.9 in) between perpendiculars, a beam of 17.48 m (57 ft 4 in) at the waterline and a mean draught of 6.71 m (22 ft 0 in) at deep load. The vessel displaced 6,579 metric tons (6,475 long tons) and had a ship's complement that numbered 299 sailors of all ranks.[1][2]
Jemmapes was powered by two triple-expansion steam engines that each drove one propeller shaft using steam provided by 16 Lagrafel and d'Allest Belleville boilers. The engine was rated at 8,400 indicated horsepower (6,300 kW) at 108rpm. While undertaking sea trials, Jemmapes reached a speed of 15.68 knots (29.0 km/h; 18.0 mph) from 9,118 ihp (6,799 kW). In service, speed was restricted as a bow wave was created at 13 knots (24 km/h; 15 mph) which, by 15 knots (28 km/h; 17 mph) became impossible to push forward, meaning this became the de facto maximum speed. The ship carried 335 tonnes (330 long tons; 369 short tons) of coal, which gave a range of 2,667 nautical miles (4,939 km; 3,069 mi) at a cruising speed of 10.9 knots (20.2 km/h; 12.5 mph). The maximum load of coal was 350.84 tonnes (345.30 long tons; 386.73 short tons).[1] Once in service, a range of 1,000 nautical miles (1,900 km; 1,200 mi) at 14 knots (25.9 km/h; 16.1 mph) was claimed.[3]
Jemmapes carried a main battery of two Canon de 340 mm (13.4 in) Modèle 1887 guns in a two single-gun turrets, one forward of the superstructure and the other aft. The guns were manually-loaded and fired one round every five minutes, but this was sped up between 1900 and 1902 with new equipment. Secondary armament was provided by four 100 mm (3.9 in) 45-calibre M1891 QF guns mounted at the corners of the shelter deck. Defence from torpedo boats was provided by six Canon de 47 mm (1.9 in) Modèle 1885 Hotchkiss guns and eight 37-millimetre (1.5 in) Hotchkiss revolving cannon.[1]
The ship had a full-length waterline armor belt that tapered from the maximum thickness of 460 mm (18 in) amidships to 410 mm (16 in) aft and 310 mm (12 in) forward. The belt was 1.9 m (75 in) high amidships. The armor was hammered steel on the port side and compound armor on the starboard. The turrets were protected by 450 mm (18 in) thick compound armor that was mounted on fixed bases 400 mm (16 in) thick while the gun shields for the secondary armament was provided by hammered steel armor 80 mm (3.1 in) thick. The main deck was protected by 50-millimeter (2 in) thick iron plates. The laminated steel plates protecting the conning tower measured 80 mm (3.1 in) in thickness.[1]