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A method used in quarrying to obtain large, regular blocks of building stones; a row of holes is drilled, either by hand or by pneumatic drills, close to each other so that a longitudinal crevice is formed into which a gently sloping steel wedge is driven, and the block of stone can be detached without shattering.
The act of changing the course of a borehole by using a deflecting wedge.
The lodging of two or more wedge-shaped pieces of core inside a core barrel, and therefore blocking it.
The material, moss, or wood used to render the shaft lining tight.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.