All Geological Engineering

Inventions whose working principle is the exploration of the ground and the rock beneath it: drilling equipment that bores or cores the earth, and instruments that generate or record seismic waves. Belongs here: the drilling rig, the core drill, the geophone, the seismic source and the seismograph. Does not belong here: instruments that measure weather or the sky, which sit with mechanical engineering, and surveying instruments for building works, which sit with civil engineering.