Gimbals

or /mhw>, n. [ See Gimmal, n. ] A contrivance for permitting a body to incline freely in all directions, or for suspending anything, as a barometer, ship's compass, chronometer, etc., so that it will remain plumb, or level, when its support is tipped, as by the rolling of a ship. It consists of a ring in which the body can turn on an axis through a diameter of the ring, while the ring itself is so pivoted to its support that it can turn about a diameter at right angles to the first. [ 1913 Webster ]

Gimbal joint (Mach.), a universal joint embodying the principle of the gimbal. --
Gimbal ring, a single gimbal, as that by which the cockeye of the upper millstone is supported on the spindle. [ 1913 Webster ]