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 .
After World War I, New Zealand bought two of first aircraft ever built by Boeing, the B&W floatplane. Both two-float seaplanes were used for pilot training, and one of the B&Ws made New Zealand's first official airmail flight on December 16, 1919.