Dictionary - Definition of AIR CROSSING


Part of Speech	Definition
Expression	1. A passage for air in a mine.[Websters].
Source: Webster's Revised Unabridged Dictionary (1913)		Top

Common Expressions: AIR CROSSING

Expressions	Definition
Air crossing	A passage for air in a mine. Source: Webster's Revised Unabridged Dictionary.
Source: compiled by the editor from various references; see credits.		Top

Expressions	Domain	Definition
Air crossing	Mining	A bridge where a return airway passes over (overcast) or under (undercast) an intake airway; it is generally constructed with bricks, or concrete and steel joists, and the whole made airtight to prevent intermixing of the two air currents. Source: European Union. (references)
Flapper-topped air crossing	Mining	Eng. An air crossing fitted with a double door or valve giving direct communication between the two air currents when forced open by the blast of an explosion. (references)
Natural air crossing	Mining	An air crossing in which two airways are separated by rock in its natural state. (references)
Source: compiled by the editor from various references; see credits.			Top