Because of the First World War, Wegener's book went unnoticed outside Germany. In 1922, however, a third (revised) edition was translated into English, French, Russian, Spanish, and Swedish, pushing Wegener's theory of continental drift to the forefront of debate in the Earth sciences.
A drilling machine, called a drill press, is used to cut holes into or through metal, wood, or other materials (Figure 4-1). Drilling machines use a drilling tool that has cutting edges at its point.
Methods which use circulation (drilling) fluids to carry drill cuttings to the surface. 1  Rotary Drilling Rotary (direct) Drilling. Reverse Circulation Rotary Drilling (RC) Dual-wall Reverse Circulation Drilling. 2  Percussion Drilling. Cable-tool Percussion.