Adjustment of polarity; specifically, in wire-line practice, the use of transpositions between transposition sections of open wire or between lengths of cable, to cause the residual cross-talk couplings in individual sections or lengths to oppose one another.

A technique used in the refining of copper that consists of the thrusting of green-wood poles into the molten metal in order to generate the reducing gases that react with the oxides in the metal.

The act or process of temporarily protecting the face of a level, drift, or cut by driving poles or planks along the sides of the yet unbroken ground.