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A gin pole in use loading logs A gin pole used to install a weather vane atop the 200-foot steeple of a church Roof trusses being assembled with gin poles. A gin pole is a mast supported by one or more guy-wires that uses a pulley or block and tackle mounted on its upper end to lift loads. The lower end is braced or set in a shallow hole and ...
A derrick is a lifting device composed at minimum of one guyed mast, as in a gin pole, which may be articulated over a load by adjusting its guys. Most derricks have at least two components, either a guyed mast or self-supporting tower, and a boom hinged at its base to provide articulation, as in a stiffleg derrick. The most basic type of ...
Shear legs are a lifting device related to the gin pole, derrick and tripod (lifting device). Shears are an A-frame of any kind of material such as timbers or metal, the feet resting on or in the ground or on a solid surface which will not let them move and the top held in place with guy-wires or guy ropes simply called "guys".
Derrick (#14) is the support structure for the equipment used to lower and raise the drill string into and out of the wellbore. This consists of the sub-structure (structure below the drill floor level) and the mast. Desander / desilter (not pictured) contains a set of hydrocyclones that separate sand and silt from the drilling fluid. Typically ...
The Keller derrick is the Mormon derrick type, distinguished by its quatrepodal base supporting an upright mast, at the top of which pivots a boom. The base is built of three six-by-six timbers, cut on a circular saw, laid over two similar sills and notched with straight-sided saddle notches at the intersections of sill and crosspiece.
Oklahoma Gin. Play the popular variation on the classic game of Gin. By Masque Publishing
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A ladder was typically fitted to the mast to permit access to the top of the derrick for maintenance purposes. Ladders could be wooden rungs fastened directly to the side of the mast or complete ladders with steel rungs and side rails. Derrick type lifts were in use by 1893. They were used mostly to load cane into main line railway wagons. [1]