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An illustration of an iron derrick, a lifting device composed of one mast or pole which is hinged freely at the bottom. It is controlled by lines (usually four of them) powered by some means such as man-hauling or motors, so that the pole can move in all four directions. A line runs up it and over its top with a hook on the end, like with a crane. It is commonly used in docks and onboard ships. Some large derricks are mounted on dedicated vessels, and are often known as "floating derricks".

Derrick

An illustration of an iron derrick, a lifting device composed of one mast or pole which is hinged freely…

An illustration of a derrick which is a lifting device made up of one pole which moves in all four directions between four lines.

Derrick

An illustration of a derrick which is a lifting device made up of one pole which moves in all four directions…

Device that is used for lifting and moving large objects; A framework that is constructed over a mine or oil well for the purpose of boring or lowering pipes

Industrial Derrick

Device that is used for lifting and moving large objects; A framework that is constructed over a mine…

This is a hay lifting device composed of one mast or pole which is hinged freely at the bottom. It is controlled by about four lines powered by some means such as man hauling, so that the pole can move in all four directions. A line runs up it and over its top with a hook on the end, like with a crane.

Hinged Hay Derrick

This is a hay lifting device composed of one mast or pole which is hinged freely at the bottom. It is…