Ground strata examination implement - has camera in tube viewing through flush window and sending picture data back to surface

摘要

A vertical tube is used. The end driven into the ground can have a conical point. The wall of the tube has a viewing window flush with its outer surface. Behind the window is a light source and a camera. The camera sends picture data describing the ground strata up to the surface for displaying. The camera has a picture tube coaxial inside the tube and one or more prisms or mirrors. Alternatively, the camera is replaced by an optical fibre. The tube may be a sampling tube. The window may be a coaxial ring or ring segments in the outer surface of the tube.