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 .
Researcher throws light on Shivkar Talpade of Mumbai, who relied on ancient text 'Vaimanikprakarnm' to build model aircraft. The Wright brothers, Orville and Wilbur, are acknowledged to have invented and built the worldâs first successful airplane and made the first controlled, powered and sustained flight in 1903.