Trunnion
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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
Gimbal
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A gimbal is a pivoted support that permits rotation of an object about an axis. A set of three gimbals, one mounted on the other with orthogonal pivot axes, may be used to allow an object mounted on t
Trunnion
…Often used in opposing pairs, this joint allows tight tolerances and strength from a large surface contact area between the trunnion and the cylinder. Gimbal…
Cardan suspension in Villard de Honnecourt's sketchbook (ca. 1230)
Early modern dry compass suspended by gimbals (1570)
Man using gimbal for smartphone
A Baker-Nunn satellite-tracking camera on an altitude-altitude-azimuth mount