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 brothers Orville and Wilbur Wright were two Americans who are  gener â¦ ally credited with inventing and building the world's first  successful airplane and making the first controlled, powered and  sustained heavier-than-air human flight, on 17 December  1903 in Kitty Hawk, NC on December 17, 1903.