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Lifts and moves heavy objects; lifting tackle is suspended from a pivoted boom that rotates around a vertical axis.

Construction Crane

Lifts and moves heavy objects; lifting tackle is suspended from a pivoted boom that rotates around a…

A crane is a lifting machine, generally equipped with a winder (also called a wire rope drum), wire ropes or chains and sheaves, that can be used both to lift and lower materials and to move them horizontally.

Naval Crane

A crane is a lifting machine, generally equipped with a winder (also called a wire rope drum), wire…

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…