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direct push

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

notation 4.2 more like this
definition Direct push technology includes several types of drilling rigs and drilling equipment which advances a drill string by pushing or hammering without rotating the drill string. Direct push rigs include both cone penetration testing rigs and direct push sampling rigs such as a PowerProbe or Geoprobe. Direct push rigs typically are limited to drilling in unconsolidated soil materials and very soft rock. Direct push drilling rigs use hydraulic cylinders and a hydraulic hammer in advancing a hollow core sampler, typically no longer than 2 metres, to gather soil and groundwater samples. The core pipe has a valve on top that is used to create a vacuum at the top of the core when pulling the core out of the sediment. The method can be used in up to 5m of water. more like this
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http://resource.geosciml.org/classifier/cgi/boreholedrillingmethod/delft_sampler original
broader direct_push original
http://resource.geosciml.org/classifier/cgi/boreholedrillingmethod/geoprobe_core original
broader direct_push original
http://resource.geosciml.org/classifier/cgi/boreholedrillingmethod/gravity_core original
broader direct_push original
http://resource.geosciml.org/classifier/cgi/boreholedrillingmethod/kasten_core original
broader direct_push original
http://resource.geosciml.org/classifier/cgi/boreholedrillingmethod/mackereth_core original
broader direct_push original
http://resource.geosciml.org/classifier/cgi/boreholedrillingmethod/piston_core original
broader direct_push original
http://resource.geosciml.org/classifier/cgi/boreholedrillingmethod/window_sampler original
broader direct_push original
source https://en.wikipedia.org/wiki/Drilling_rig#Direct_push_rigs more like this
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http://resource.geosciml.org/classifier/cgi/boreholedrillingmethod/core_drilling original
narrower direct_push original
in scheme boreholedrillingmethod original
is primary topic of direct_push