Another 305 mm gun for this post, or, to be more precise, a 30,5 cm one, as German and Austro-Hungarian armies measured the diameter of their guns in centimeters. For propaganda reasons, the author of this drwing published in Italian weekly La Domenica del Corriere couldn’t show it in action, but only being caught by valiant Italian soldiers (on the Bainsizza front, according to the caption).
Some WW1 Photographs... 