A special core barrel used to take soil samples, as in foundation testing. The
inner tube is swivel mounted and nonrotating and extends through, and a short
distance beyond, the bit. Hence, the bit only cuts clearance for the outer tube
or core-barrel assembly, and the core taken by the inner tube is cut by a
spudding action. The triple or core tube is mounted inside the inner tube to
receive the core and is split longitudinally to facilitate removal of the core.
Also called clay barrel. Long
Dictionary of Mining, Mineral, and Related Terms