a. A double-tube core barrel with a greater-than-normal clearance between
the inner and outer tubes, for use with mud-laden circulation liquids.
Long b. A bailing device to bring to the surface the cuttings formed by the
action of the bit at the bottom of a borehole in free-fall or churn
drilling. Long c. A small bailer. Long
Source:
Dictionary of Mining, Mineral, and Related Terms
