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.
Drill bits used with the impact function of these drills are dedicated masonry or concrete bits with flattened, tungsten carbide tips. An impact drill may be used to drill into a variety of hard, aggregate materials such as brickwork, cement, and concrete.