View of The San Francisco Oakland Bay Bridge (San Francisco – Oakland Bay Bridge, San Francisco, CA, United States) over San Francisco Bay at the Pacific Ocean. Ceremonies where the bridge was opened to general traffic after completion of construction in 1936. California Governor, Frank Finley Merriam, uses a blowtorch to cut a chain, officially opening the bridge to vehicle traffic. Cars are seen massed, ready to commence the crossing. Cars pass through lane dividers and drive on the bridge. View of the towers and suspension cables from a car passing underneath. Buildings seen from the bridge. Traffic on the bridge. (From a 1961 newsreel recounting events 25 years earlier.)
United States and foreign officers attend the Command and Staff College at Fort Leavenworth, Kansas.
Documents the excavation and construction of the Boulder Dam (Later named Hoover Dam). Boat in a river at the Black Canyon. A man points to the map of United States. Water floods in agricultural district. River in a deep valley between cliffs. Map points out Black Canyon of the Colorado River, on the border between Arizona and Nevada. Deserts of South West. Excavating mountains by truck. Cargo train runs on track. Men work in factories. Industrial equipment. Engineers and surveyors at construction site. Small town (Boulder City) built to house employees. Various buildings of town. Building housing the officers of Pacific administration. Traffic on street and gardens outside houses. White cottages in town. Cooks prepare food in kitchen. Men served in large dining hall. Passenger trucks loaded with workers, moves for dam site. Workers leave trucks at dam site.
Early period construction of Hoover Dam. Black Canyon shows river in deep valley between cliffs. Man and materials transferred on Catwalk Bridge. Rocks blasted to make ways. Tunnels excavated in mountains by men. Men bore holes in mountain. Man work on steel rods. Trucks loaded with rocks move up the road on mountain. Trucks dump rocks. Tunnels are aligned with concrete after excavation. Men work with equipment. Rocks on top of the cliffs blasted. Men engaged in drilling and handling explosives. Workers transported through cables suspended between cliffs. Men drill holes in Canyon walls. Holes are blasted. Men suspended from cliff-top. River is diverted toward tunnel. River flows into tunnel. Trucks dump rocks. Excavation vehicles used at construction site. Shovel excavator in operation. Dump trucks are driven. Roads carved in mountains to transport men and material. Rock surfaces prepared for the reception of concrete.
Construction of Hoover Dam shows a large tractor crane operating. Crane shovel picks up a scoop of sand and gravel from ground. Cargo train crosses a bridge over river. Equipment processes raw materials. Raw material is dumped into hopper from where material is conveyed into plant over belts. Equipment operates. Washing of gravel and sand. Sand and gravel loaded into rail car for transportation. Train loaded with raw material moves on track. Concrete mixing plant equipped with heavy machines. Railroad cars used to transfer material. Men work with pneumatic pump. High level concrete mixing plant shows an operator besides equipment which controls the proportion of concrete ingredients and maintains graphic control. Man at control deck of plant operates the equipment. Raw materials on conveyor belt are dumped into rotary motor. Materials transferred by electric trains. High capacity dump trucks are used. Buckets loaded with materials are transferred by electric trains. Aerial cable ways used to transfer material.
Construction of Hoover Dam in June 1933. A bucket of concrete is lowered on ground from mountain top. Base of structure is prepared. Vehicles move on road on Canyon (Black Canyon) wall. Buckets of concrete suspended by cables are dumped on ground. Material is offloaded from truck and transferred through cable ways. Concrete buckets transferred from cliffs. Bucket descends and received by men on ground. Men shovel concrete and operate equipment. Workers from Canyon rim are transferred on ground. Concrete bucket lowered on to construction site. Construction in progress. Two intake towers on each side of the Canyon wall. Other structures constructed for dam.
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