A small hole drilled into a rock or boulder into which an anchor bolt or a small charge or explosive may be placed; used in quarries for breaking large blocks of stone or boulders.



Related Terms

BASKET

  1. A lightweight container with perforations. 2. A type of single tube core barrel made from thin-wall tubing with the lower end notched into points, which is intended to pick up a sample of granular or plastic rock material by bending in on striking the bottom of the borehole or solid layer; may be used to recover an article dropped into a borehole. Also known as basket barrel; basket tube; sawtooth barrel.

CORE DRILL

A mechanism designed to rotate and to cause an annular-shaped rockcutting bit to penetrate rock formations, produce cylindrical cores of the formations penetrated, and lift such cores to the surface, where they may be collected and examined.

HEAVY LIFT CHARGE

A charge typically imposed when special lifting gear is required to handle a given piece of cargo, which may be of either heavy weight or of large dimensions (often referred to as 'out of gauge' when dealing with container vessels).

BULLNOSE

A reinforced hole in the bulwarks at the foremost point of the bow through which a towing hauser or bowline may pass without snagging or encountering excessive wear.

BEATER

  1. A tool for packing in material to fill a blast hole containing a charge of powder. 2. A laborer who shovels or dumps asbestos fibers and sprays them with water in order to prepare them for the beating. 3. A machine that cuts or beats paper stock.

BLASTHOLE

  1. A hole that takes a heavy charge of explosive. 2. The hole through which water enters in the bottom of a pump stock.

HAWSEPIPE

The shaft or hole in the side of a vessel's bow through which the anchor chain passes.

COUNTERSUNK HOLE

An edge bevelled hole in a plate allowing a matching tapered bolt head to seat flush with the plate's surface.

MINIMUM BILL OF LADING

A clause in a bill of lading which speci es the least charge that the carrier will make for issuing a lading. The charge may be a de nite sum or the current charge per ton for any specified quantity.

EYELET

  1. A bolt with a loop at one side 2. A small ring or barrel-shaped piece of metal inserted into a hole for reinforcement.

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