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.
Drilling hammers are intended to be used for striking chisels, punches, star drills, spikes and hardened nails. The striking face of the ball peen hammer is used for striking. punches and chisels. The ball peen end is used for riveting, shaping. and straightening unhardened metals.