Trunnion
A trunnion (from Old French trognon 'trunk') is a cylindrical protrusion used as a mounting or pivoting point. First associated with cannons, they are an important military development.
A trunnion (from Old French trognon 'trunk') is a cylindrical protrusion used as a mounting or pivoting point. First associated with cannons, they are an important military development.
A trunnion (from Old French trognon 'trunk') is a cylindrical protrusion used as a mounting or pivoting point. First associated with cannons, they are an important military development.
Source: Wikipedia "Trunnion" · CC BY-SA 4.0
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