Mining Glossary

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Timber - Any of the wooden props, posts, bars, collars, lagging, etc., used to support mining works. One of the steel joists or beams which, in some mines, have replaced wooden timbers.

Timbering - The operation of setting timber supports in mine workings or shafts. The term support would cover the setting of timber, steel, concrete, or masonry supports.

Timbering Machine - An electrically driven machine to raise and hold timbers in place while supporting posts are being set after cut to length by the machine's power-driven saw.

Tipple - Originally the place where the mine cars were tipped and emptied of their coal, and still used in that sense, although now more generally applied to the surface structures of a mine, including the preparation plant and loading tracks.

Trailing Cables - A flexible electric cable for connecting portable face machines and equipment to the source of supply located some distance outby. The cable is heavily insulated and protected with either galvanized steel wire armoring, extra stout braiding hosepipe, or other material.

Trolley Wire - The means by which power is conveyed to an electric trolley locomotive. It is hung from the roof and conducts power to the locomotive by the trolley pole. Power from it is sometimes also used to run other equipment.