Very brief view of a young man and woman posing for the camera, in United States. They smile and kid around. The man pulls at his upper lip in jest.
The diversion of the Colorado River during the construction of Boulder Dam on the river in the United States. The dam site on the river. Two tunnels seen on one side of the river. A blast at the entrance of one of the tunnels to divert the flow of the river. Two men at the entrance of the tunnel. Trucks unload excavation material to form a temporary dike to control the water flow. The river flowing around the dam site. A bridge is visible. Water flows through a huge diversion tube. Cliffs on both sides. A truck unloads construction material in a cofferdam. Construction equipment in the cofferdam. Cofferdams on the river bed to provide foundation for the dam. Equipment operated at the site. Trucks and as crane at the site. Roads along the canyon walls in view. Men at work at the site. Barriers of the coffer dam in view. Men at the site. Cliffs on both sides. Workmen operate equipment.
The preparation and transportation of raw materials for the construction of Boulder Dam on the Colorado River in the United States. A crane and a train near the dam site. Sand and gravel picked from a pit by the crane and loaded in to rail cars. Trains arrive at a screening plant. A man near a train. The sand and gravel dumped into hoppers. Conveyor belts carry the material to the plant. A man near a conveyor belt. A man watches equipment screening over sized pebbles. A man near the screening plant. The screening plant with four towers for separating gravel of different size. Conveyor belts carry the screened gravel. Three different piles of gravel formed. Sand combined in a mixer. The towers of the plant in view. A man in a tower. Conveyor belts load the material into rail cars for transportation.
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.
CRITICALPAST.COM: About Us | Contact Us | FAQs - How to Order | License Agreement | My Account | My Lightboxes | Shopping Cart | Advanced Search | Featured Collections | Website Terms & Conditions | Privacy Policy ©2026 CriticalPast LLC.
License Agreement |
Terms & Conditions |
Privacy Policy
©2026 CriticalPast LLC.