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U

Universal Coupling

Couplings used on the ends of the propeller shaft of motor vehicles to allow for the movement of the rear axle relative to the gear box. It consists of a modern version of Hooke’s coupling in which two yokes set at 90° to each other are joined by a trunnion block.

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Unconformity

A substantial break in the continuity of deposition, where one rock formation is overlain by another that is not the next in geological succession. The underlying older rocks may have a dip which is in marked contrast with the overlying younger rocks.

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Uni-flow

In washers, the mineral being treated and the wash water flow in the same direction and, in screening, the direction of vibration of an inclined screen is such as to assist the passage of mineral along the screen.

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