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diamond core

http://resource.geosciml.org/classifier/cgi/boreholedrillingmethod/diamond_core

notation 4.1 more like this
definition Diamond core drilling (or diamond drilling) utilizes an annular diamond- or tungsten-carbide-impregnated drill bit attached to the end of hollow drill rods to cut a cylindrical core of solid rock. The diamonds used are fine to microfine industrial grade diamonds. They are set within a matrix of varying hardness, from brass to high-grade steel. Matrix hardness, diamond size and dosing can be varied according to the rock which must be cut. Holes within the bit allow water to be delivered to the cutting face. This provides three essential functions: lubrication, cooling, and removal of drill cuttings from the hole. Core samples are retrieved via the use of a core tube, a hollow tube placed inside the rod string and pumped with water until it locks into the core barrel. As the core is drilled, the core barrel slides over the core as it is cut. An "overshot" attached to the end of the winch cable is lowered inside the rod string and locks on to the backend (aka head assembly), located on the top end of the core barrel. The winch is retracted, pulling the core tube to the surface. The core does not drop out of the inside of the core tube when lifted because either a split ring core lifter or basket retainer allow the core to move into, but not back out of the tube. more like this
source https://en.wikipedia.org/wiki/Drilling_rig#Diamond_core_drilling more like this
type
Resource original
Concept original
broader
http://resource.geosciml.org/classifier/cgi/boreholedrillingmethod/core_drilling original
narrower diamond_core original
in scheme boreholedrillingmethod original
is primary topic of diamond_core
narrower
http://resource.geosciml.org/classifier/cgi/boreholedrillingmethod/conventional_core original
broader diamond_core original