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 .
The history of airplanes dates back to the late 18th century. But the first-ever powered airplane flight was made on December 17, 1903, by the Wright brothers. The aircraft was named aËFlyeraâ¢ at Kitty Hawk, North Carolina. In 1911, the Wrightsaâ¢ Vin Fiz was the first airplane to cross the United States.