A derrick basically is a lifting mechanism poised on one mast or pole which is hinged liberally at the base. It is operated by lines motorised by several such means as man-hauling or motors, so that the pole can travel in all four directions.
A line goes right to the top with a hook on its end, like with a crane. It was regularly used in docks. The device gets its name from Thomas Derrick who was an English executioner during the Elizabeth period because of its similarity to the structure from which a hangman's noose hangs.
Another type of derricks is generally applied over oil-wells and other drilled holes. This is commonly known as an oil derrick and basically is a compound set of machines particularly designed for finest efficiency, safety and low cost.
A line goes right to the top with a hook on its end, like with a crane. It was regularly used in docks. The device gets its name from Thomas Derrick who was an English executioner during the Elizabeth period because of its similarity to the structure from which a hangman's noose hangs.
Another type of derricks is generally applied over oil-wells and other drilled holes. This is commonly known as an oil derrick and basically is a compound set of machines particularly designed for finest efficiency, safety and low cost.
