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.
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.