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Fig. 1. Photograph of soil-coring system (fully extended position) getting ready to insert small-diameter core tube: (A) outer pipe section, (B) hydraulic post driver (ports visible at top right side of post driver), (C) slots in outer pipe section allowing passage of inner pipe mounting brackets, (D) support structure (with bottom braces) connected to the inner pipe section and bumper unit, (E) lock pin which holds driving head in bore of post driver, (F) inner pipe section (housing hydraulic cylinder) connected to bumper unit, (G) small-diameter core tube, (H) hoses for hydraulic cylinder passing through hole in inner pipe section, (I) insert showing system in fully retracted position (note that screwdriver has been inserted through core tube and driving head before extraction), (J) insert showing starting position for insertion of large core tube, and (K) insert showing extraction of large core tube.
