French submarine Gay-Lussac

A postcard of sister ship Monge underway before 1915
History
France
Name:	Gay-Lussac
Builder:	Arsenal de Toulon
Laid down:	1906
Launched:	17 March 1910
Completed:	14 January 1911
Struck:	1 December 1919
Identification:	Pennant number: Q69
General characteristics (as built)
Class and type:	Pluviôse-class submarine
Displacement:	404 t (398 long tons) (surfaced) 553 t (544 long tons) (submerged)
Length:	51.12 m (167 ft 9 in) (o/a)
Beam:	4.96 m (16 ft 3 in)
Draft:	3.15 m (10 ft 4 in)
Installed power:	700 PS (510 kW; 690 bhp) (steam) 2 × Du Temple boilers 400 PS (290 kW; 390 bhp) (electric motors)
Propulsion:	2 × shafts; 2 × Triple-expansion steam engines 2 × electric motors
Speed:	12 knots (22 km/h; 14 mph) (surfaced) 8 knots (15 km/h; 9.2 mph) (submerged)
Range:	1,000 nmi (1,900 km; 1,200 mi) at 8.5 knots (15.7 km/h; 9.8 mph) (surfaced) 27 nmi (50 km; 31 mi) at 5 knots (9.3 km/h; 5.8 mph) (submerged)
Complement:	2 officers and 23 crewmen
Armament:	1 × twin 450 mm (17.7 in) Drzewiecki drop collar 4 × external 450 mm torpedo launchers (2 × facing forward, 2 × aft)

Gay-Lussac was one of 18 Pluviôse-class submarines built for the French Navy in the first decade of the 20th century.