A drill derrick divided into two or more sections, made so that the uppermost sections nest successively into the lower sections. in use, the sections are extended and locked into place to form a tall derrick and when moved are nested to form a unit length transportable on a single truck. compare telescopic tripod.
A drill tripod each leg of which. is a series of two or more closely fitted nesting tubes, which can be locked rigidly together in an extended position to form a long leg or nested one within the other to shorten the leg while it is being transported from one drill site to another.
A misnomer applied to a drill-hoisting derrick, hinge-mounted on a truck-mounted drill machine, that is raised or lowered by means of hydraulic pistons.
