| 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: | 52.2t[1] |
| Length: | 9.7m (31.8feet) L/28.5 calibres |
| Cartridge: | Separate loading bagged charges and projectiles |
| Cartridge Weight: | AP: 925.9disp=flipNaNdisp=flip Common: 771.6disp=flipNaNdisp=flip |
| Caliber: | 340mm |
| Velocity: | 1969disp=flipNaNdisp=flip |
| Breech: | Interrupted screw |
The 340mm/28 Modèle 1881 gun was a heavy naval gun of the French Navy.
The type was used in single mountings on the ironclads of the Marceau class, and on the Hoche.
| 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: | 187t |
| Part Length: | 9.7m (31.8feet) L/28.5 calibres[2] |
| Cartridge: | Separate loading bagged charges and projectiles |
| Cartridge Weight: | 430kg (950lb) |
| Caliber: | 3400NaN0 |
| Rate: | 1 round every five minutes |
| Velocity: | 430m/s |
| Max Range: | 19km (12miles) |
| 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.[3]