Obice da 305/17 was an Italian howitzer used during World War I. Produced by the Armstrong works in Italy between 1914 and 1917, approximately 30-44 were built. Originally the Obice da 305/17 Modello
A 305/17 on a Garrone coastal mount.
A 305/17 showing its box trail carriage, screw breech, traverse wheels and loading tray.
A 305/17 modello 16 howitzer on a De Stefano carriage with Bonagente grousers.
A 305/17 modello 16 captured by the Austrians in a village near Udine. Photo by Jindřich Bišický.
A trunnion is a cylindrical protrusion used as a mounting or pivoting point. First associated with cannons, they are an important military development.
The trunnions are the protrusions from the side of the barrel that rest on the carriage.
Early Chinese cannon with trunnions, Yuan Dynasty (1271–1368). Kept in Zhejiang Provincial Museum.
16th-century depiction of a cannon with trunnions
Gun trunnions often bear factory markings