The museum where I volunteer has an unidentified steel 24-cm cartridge case. It is 240 mm at the mouth x148 mm long with a rim diameter of 257mm. What makes it unusual is the dished (concave) base - indented about 25-mm. BOCN members identified the primer as probably French. The brass fringe may be a later modification by a previous owner.
Any help in identifying the casing and the parent gun would be appreciated.
-240 mm modèle 1903 TR: a coast gun with self loading (31 guns made).The base is concave because the bolt was a "bloc culasse automatique système Canet". The powder bag is more longuer that the case.
-240 mm modèle 1903 TR: railway gun, this is the coast gun mounted in Railway carriage in 1915 (16 guns made).
This is the case for the gun "240 mm modèle 1903 TR", a french coast gun (31 made).Some were mounted on railway carriage during WW1 (16 made). The gun had a self-loading device and automatic breech "bloc culasse système Canet". Yours sincerely, Guy.
I suggest my book: Guy François- "Les Canons de la Victoire"-tome 2-"L'Artillerie Lourde à Grande Puissance".This is the second volume edited in 2008 by "Histoire et Collections" in Paris (the first tome 1 was "Artillerie de Campagne" writed by F.Vauvillier and P.Touzin). In 64 pages, the book depicts 59 different french guns of WW1 from 95 mm armoured waggon to 520 mm howitzer (Railway artillery, big mortars, Marine guns in Land service). The 240 mm modèle 1903 TR is illustrated with 2 photographs and 1 color plate. Yours sincerely, Guy.