A headframe(also known as a gallows frame, winding tower, hoist frame, pit frame, shafthead frame, or headgear) is the structural frame above an underground mine shaft. Modern headframes are built out of steel, concrete or a combination of both. Timber headframes are no longer used in industrialized countries, but are still used in developing nations. Traditionally steel headframes are used when a drum hoist is employed, and concrete headframes are built for friction hoists, however a steel headframe can be used with a friction hoist for shafts with a smaller capacity and depth.
From Wikipedia, the free encyclopedia (version june 7, 2012).
- Shooting date : 07/01/2012 14:32:06 (Europe/Brussels)
- camera : Nikon D7000
- exposure speed : 1/125 (0.008 sec)
- aperture : f/7.1
- ISO sensitivity : ISO 100
- lens : Sigma 17-50mm f/2.8 EX DC OS HSM
- focal length : 17mm (cadrage équivalant : 26mm)
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