1 Discard any hammer with mushroomed or chipped face or with cracks in the claw or eye sections. 2  Wear safety glasses or goggles, or a face shield (with safety glasses or goggles).  Strike a hammer blow squarely with the striking face parallel to the surface being struck.
The first jet airplane was the Heinkel He 178 made in Germany in 1939, right before the outbreak of World War II .
Charles Taylor. Charles Taylor built the engine that provided the power to achieve the first powered, sustained, and controlled flight of an airplane.on December 17, 1903 by Orville and Wilbur Wright.