1. A conical-nosed cylindrical weight, attached to a wire rope or line, either notched or seated to engage and attach itself to the upper end of a wire line core barrel or other retrievable or retractable device that has been placed in a borehole. Also known as bug; go-devil; overshot.

2. A scraper with self-adjusting spring blades, inserted in a pipeline and carried forward by the fluid pressure, clearing away accumulations or debris from the walls of a pipe. Also known as go- devil.

3. A bullet-shaped weight or small explosive charge dropped to explode a charge of nitroglycerin placed in a borehole. Also known as go- devil.

4. An electric lamp covered by a conical metal case, usually at the end of a flexible metal shaft.

5. See <<torpedo>>

A hollow hemispherical shell, made of iron and filled with pitch, which holds small objects during the execution of artistic designs in metal.

A small, lustrous, nearly spherical industrial diamond.

The projectile fired, or intended to be fired, from a small arm.