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 .
1 The Life of the Wright Brothers and Their Flying Machine In 1903, Orville and Wilbur Wright made the first powered flight that would forever change mankind's quest to conquer the skies.here are a number of claims to earlier powered flight, most notably by Richard Pearse, a New Zealand pioneer aviator who purportedly made a powered flight on March 31, 1902. However, most aviation historians credit the Wright brothers with having first achieved the feat.