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 bit upper left mounted on a pistol grip corded drill drill bits are cutting tools used to remove material to create holes almost always of circular cross section drill bits come in many sizes and shape and can create different kinds of holes in many different materials in order to create holes drill bits are attached to a drill which powers them to cut through the workpiece typically by rotation the drill will grasp the upper end of a bit called the shank in the chuck