Derrick
![Two guy derricks at a granite quarry](https://upload.wikimedia.org/wikipedia/commons/b/b1/Two_Guy_Derricks_at_a_Granite_Quarry.jpg)
Derricks are especially useful for high-rise rigging, jobs that cover a long period of time, or jobs when the impact to street or pedestrian traffic is a concern. Forms of derricks are commonly found aboard ships and at docking facilities. Large derricks mounted on dedicated vessels are known as floating derricks and shearlegs.
The term derrick is also applied to the framework supporting a drilling apparatus in an oil rig. The derrick derives its name from a type of gallows named after Thomas Derrick, an Elizabethan era English executioner. Provided by Wikipedia
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