340 mm/28 Modèle 1881 gun

• Name — 340mm/28 Modèle 1881 • Origin — France • Type — Naval gun • Is Ranged — YES • Is Artillery — YES • Is Uk — YES • Service — 1881-1922 • Used By — France • Weight — 52.2 t • Length — 9.7 m L/28.5 calibres • Cartridge — Separate loading bagged charges and projectiles • Cartridge Weight — AP: 925.9 lb Common: 771.6 lb • Caliber — 340 mm • Velocity — 1969 ft/s • Breech — Interrupted screw

The type was used in single mountings on the ironclads of the Marceau class, and on the Hoche.

• Name — Canon de 340 modèle 1881/84 à glissement • Origin — France • Type — Railway gun • Is Ranged — yes • Is Artillery — yes • Service — 1919-? • Designer — Schneider • Design Date — 1917 • Manufacturer — Schneider • Production Date — 1918 • Number — 8 • Weight — 187 t • Part Length — 9.7 m L/28.5 calibres • Cartridge — Separate loading bagged charges and projectiles • Cartridge Weight — 430 kg • Caliber — 340 mm • Rate — 1 round every five minutes • Velocity — 430 m/s • Max Range — 19 km • Breech — Interrupted screw breech • Recoil — Carriage recoil • Carriage — Two six-axle bogies • Elevation — +3° to +40° • Traverse — None Eight guns were converted from naval use to railway guns by Schneider and designated Canon de 340 modèle 1881/84 à glissement. The conversions were ordered during 1917 but they weren't delivered until January 1919 after the war had ended. The guns were suspended from two six-axle rail bogies and used carriage recoil known as the glissement system. The guns had no traverse mechanism so aiming was done by drawing the guns across a section of curved track.

• BL 13.5 inch naval gun Mk I – IV: British equivalent