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.
This type of drill machine is used for very light works. Fig.1 illustrates the sketch of sensitive drilling machine. The vertical column carries a swiveling table the height of which can be adjusted according to the work piece height.The table can also be swung to any desired position.he drilling operation can also be accomplished in lathe, in which the drill is held in tailstock and the work is held by the chuck. The most common drill used is the twist drill. Drilling Machine. It is the simplest and accurate machine used in production shop.