General

A hole drilled into rock in which an explosive charge is to be placed.

A heater consisting of a set of heat-transfer coils (or sections) through which air is drawn or forced by a

An upright freezer in which air, at a very low temperature, is circulated by blowers; used to freeze foods in

Any cleaning process, such as sandblasting, in which an abrasive is directed at the surface with high velocity.

The area in which the loading of explosives and the blasting operations take place.

1.A recess in an external wall, having the external appearance of a window. 2.A window, which has been sealed off

A wall whose whole surface is unbroken by a window, door, or other opening.