Why is the drilling derrick called the drilling derrick?

"Derrick" comes from 'Thomas Derrick', a hangman who invented a type of gallows using a movable beam and pulley system during the Elizabethan era. During his lifetime, Derrick executed over 3,000 people, many of them with his modified gallows device, and the supporting framework for his gallows came to be known as a derrick. The term was adopted to describe cranes and other lifting devices which used a similar support mechanism.