Canon de 164 mm Modèle 1893

The Canon de 164 mm Modèle 1893 was a medium-caliber naval gun used as the secondary armament of a number of French pre-dreadnoughts and armoured cruisers during World War I. It was used as railway artillery in both World Wars and as coastal artillery in World War II.

Description
The 45 caliber Canon de 164 mm Modèle 1893 gun was a typical built-up French heavy gun of its period. It used a Welin interrrupted-screw breech and bagged propellant with a de Bange obdurator to get a good gas seal during firing. It was replaced by the Mle 1893/96 gun which used a plastic seal for the obdurator, differed in the construction of the gun, had a slightly longer barrel of 46.6 calibers and the newer gun was able to fire a new HE shell further than that used by the older gun.

Naval mounts
The Mle 1893 and 1893/96 guns were mounted in casemated pivot mounts with the ability to depress to -10° and elevate to +25°. The guns fired 52 kg shells at a muzzle velocity of 865 m/s to a maximum range of 9000 m. The guns were also installed in single and twin-gun turrets, although data for the turrets is unavailable.

The guns were mounted on the armoured cruisers Ernest Renan, Jules Michelet, Gloire, Suffren and the cruiser Brennus. The casemate version was mounted on the Ernest Renan, Jules Michelet, République, Léon Gambetta, Gloire, Suffren, Gueydon, Iéna, Brennus and Dupuy de Lôme. The twin turret version was used on République, Léon Gambetta and Dupleix.

Railroad gun
The French placed a number of spare Mle 1893 guns on four-axle railroad carriages in 1915 to use as mobile heavy artillery. The mount with its gun weighed 60 t and was 14.7 m long. It could traverse a full 360° if its outriggers, two per side, were deployed. Photographic evidence shows that some mounts had built-up cargo compartments at both ends of the mount, which limited the gun's firing arc to approximately 90° on each side. It had a circular platform for the crew that had to be folded up for travel. Some guns were fitted with gun shields. It shared its railroad carriage with the 164 mm Mle 1893/96 M and the Canon de 194 mm 1870/93.

The gun could elevate to a maximum of 36°, but the minimum firing angle was 10°. It could fire a 50.5 kg high-explosive shell at a velocity of 775 m/s to a range of 18000 m or a 52.6 kg armour-piercing shell at a velocity of 770 m/s to a range of 15400 m. A number of Mle 1893/96 M guns were fitted to the same railroad carriage as the older model in 1917, although it only weighed 60 t. The gun could elevate between +3° and 40°, but retained the same minimum firing elevation of 10°. It could use the same ammunition as the older guns, but could also fire a new 49.8 kg high-explosive shell fitted with a ballistic cap at a velocity of 830 m/s to a range of 19200 m.

Eight of these railroad guns remained in French service after the end of World War I and at least four were captured by the Germans and given the designation 16 cm Kanone (E.) 453(f) although what use was made of them, if any, is unknown.

Coastal gun
The Germans used 32 of the Mle 1893/96 in coast defence batteries in France as the KM 93/96(f), as well as 18 of the Mle 1893 with the designation of SKL/45(f), although it is unknown how many, if any, were simply taken over from existing French coast defence positions or were newly emplaced by them.