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.
The column supports the head and the sleeve or quill assembly. * The head of the drill press is composed of the sleeve, spindle, electric motor, and feed mechanism. The head is bolted to the column. * The worktable is supported on an arm mounted to the column.