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.
How to Use a Drill Press Machine: A drilling machine comes in many shapes and sizes, from small hand-held power drills to bench mounted and finally floor-mounted models. They can perform operations other than drilling, such as countersinking, counterboring, reaming, and tapping large or small holes.
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