The transportation of raw materials for the construction of Boulder Dam on the Colorado River in the United States. A plant at the bottom of a canyon. Rail cars arrive at the plant. Concrete mixers in the plant. Another plant on the Nevada rim over the dam site. Rail cars arrive at a mixing plant with sand and gravel. Bins in the mixing plant to store sand and gravel. A vehicle on a road along the canyon. Rail cars on a track with 'Six Companies Inc.' painted on it, the company to which the contract of the dam construction has been awarded. The rail cars unload sand and gravel at the plant. Men operate pumps to unload bulk cement. Rail cars carrying cement arrive at the mixing plant. Huge concrete mixers in the plant.
Mixing plants and transportation of materials around the dam site during the construction of Boulder Dam on the Colorado River in the United States. The mixing plants at the Boulder Dam site. Huge concrete mixers in the plant. A man near an automatic machinery which controls the mixing of ingredients as well as records every operation. An operator near the control deck directs the entire mixing cycle. A man sets the machinery. Different types of machinery in the mixing plant. Ingredients loaded from hoppers onto conveyor belts. The conveyor belts carry the material and unload it into rotary mixers. A man oversees the procedure. The rotary mixers in the plant. A man near the rotary mixers. Different types of containers used to transport concrete. Men at work on the truck carrying the containers. The concrete mixers and other fixtures in the plant.
Different procedures in the construction of Boulder Dam on the Colorado River in the United States. Concrete being placed in the lowest level of the dam with a bucket. Men at the site. Work underway at the dam site. Different structures of the foundation of the dam. Motor trucks along a road. Concrete being placed on the entire lower level of the structure from a trestle anchored to the wall of a canyon. Concrete placed in interlocking columns. Transit mixers place the concrete in confined form. Buckets of concrete transported by a cable way. A bucket lowered into the forms. Safety locks of the bucket are unlatched and the concrete is dumped. Men at work in the confined form. Workmen in the skid way go to the top forms. Work underway at the dam. Buckets carrying concrete in a cable way. A part of the dam structure in view.
Stages of the construction of Boulder Dam on the Colorado River in the United States. A power plant under construction. A U-shaped structure downstream of the dam under construction. Two men near the structure. Intake towers, two on each side of the river, upstream from the dam, perched on shelves in the canyon walls. The two towers on one side of the river. Men at work on the structure. Two spill ways, one on each side of the canyon.
Installation of steel pipes during the construction of Boulder Dam on the Colorado River in the United States. A steel fabrication mill near the dam site. Motor vehicles parked outside a building. The plant beside the building with the name 'Babcock and Wilcox Co.' on the building, to whom the fabrication and installation of the steel pipes has been awarded. Steel pipes stacked near the building. A crane near the building stacks plates. A man near a stack of plates. Men at work in the plant. A man near a planing machine on which the plates are shaped. A press used for curving the plates. Men in the plant. A man in the plant near the press. Two men near a vertical roll in which the plates are rolled to a correct degree of curvature. A man operates the roll. Curved plates in view. Men at work in the plant. The curved plates are arranged. A man welds and joins the curved plates to form a ring. Two men weld the joints inside the ring. A man wearing a helmet welds the joints.
The fabrication of steel pipes during the construction of the Boulder Dam on the Colorado River in the United States. A man stands near a complete shop unit. Three curved plates are joined to form a ring. Two men in the plant. The ring sections arranged on either side. A man operates an X-ray machine used to examine welded joints. A man at a table. A man in a laboratory tests samples of welded joints. A man takes reading after testing. Men near the ring section. Another man brings a ladder. A man steps on the ladder near the section. Men at work on the welded joints. The rings being carried by hooks The ring section taken into annealing furnace for heating to equalize bending and welding strains. A man tightens the joints in the ring section with equipment. A man near a shop unit. A hook hangs beside the unit. A rail car arrives. Men on either side of a track.
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