Activities of the U.S. Army Air Corps in the United States. Formation of 18 B-10s in flight. 300 lb bombs are dropped from the aircraft. Train of bombs exploding in the field. Smoke due to explosion. Formation of B-10s in flight over clouds. Two 16 inches railroad guns. One of the railroad guns is fired. Crewmen loading the gun. A major sighting through a range finder.
Activities of the U.S. Army Air Corps in the United States. Three B-10s in flight. They fly in formation. They fly in, over and through the clouds.
LZ 129 Hindenburg airship in flight over New York City, United States. Nazi German swastika emblem on tail fins on Hindenburg as seen from a biplane in flight. Aerial view, of coastal area of New Jersey, seen from biplane. Hindenburg in flight below biplane. Hindenburg in flight over open field in New Jersey.
Boulder City at the time of the construction of Boulder Dam (later Hoover Dam) on the Colorado River in the United States. A desert area with mountains in view. Houses and buildings in Boulder City. A park with many trees. A walkway in a park. A building at a distance. The Office of the Bureau of Reclamation. A lawn around the building. A stores building. A vehicle near the building. Arcades in front of houses provide protection from the sun. Workmen's houses and buildings in clusters. Dormitories for single workmen. Two men at work in a workmen's mess. Several workmen seated at tables in a mess hall. Passenger motor trucks in front of the workmen's houses. The workmen get into the trucks. The trucks drive on a path. The workmen get down from the trucks at the dam site.
Boulder Dam under construction over the Colorado River in the United States. The Colorado River and work under way in the Black Canyon. Rocks on both sides of the river. Men in a boat bring supplies to the site. The site of work. Men cross the river on a bridge. Rocks of the canyon being blasted for providing foothold for roads and rail lines to the dam site.
Work men at work during the construction of Boulder Dam over the Colorado River in the United States. Rocks blasted in the Black Canyon for the end support of the dam. The work site of the dam. Men at the site. An aerial cable way carries workmen. Men in the cable way taken to their positions on cliffs. A man on a cliff prepares ropes. The workmen descend the cliffs with the help of the ropes.
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