Transportation of raw materials and screening of gravels and sand during the construction of Boulder Dam in the United States.
United States USA Date:1933 Duration:4 min 48 sec Sound:NO SOUND
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.
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