Before revision: A gin pole used to install a weather vane atop the 200 foot steeple of a church Roof trusses being assembled with gin poles The gin pole is derived from a gyn, and considered a form of derrick, called a standing derrick or pole derrick, distinguished from sheers (or shear legs) by having a single boom rather than a two-legged one.
After revision: EtymologyA gin pole used to install a weather vane atop the 200 foot steeple of a church Roof trusses being assembled with gin poles The gin pole is derived from a gyn, and considered a form of derrick, called a standing derrick or pole derrick, distinguished from sheers (or shear legs) by having a single boom rather than a two-legged one.