latitude nut

A correcting nut in a directional gyro or a direction indicator (DI), which is screwed in or out to correct drift caused by the earth’s rotation north or south of equator.
Latitude nut is fitted to side of the inner gimbal on a spindle. A counter-weight on the opposite side exactly balances the nut when it is in the center of the spindle, which is the setting for the equator any movement away from the center sets up a torque force, which compensates for the gyro drift for the set latitude.

Aviation dictionary. 2014.

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