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Tunnels excavated and aligned with concrete during construction of Hoover Dam, Nevada.

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.

Location: Nevada United States USA
Date: 1936
Duration: 7 min 4 sec
Sound: Yes
Color: Monochrome
Clip Type: Edited
Language: English
Clip: 65675052281
High level concrete mixing plant at Boulder Dam (Hoover Dam) construction site, Nevada.

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.

Location: Nevada United States USA
Date: 1936
Duration: 5 min 45 sec
Sound: Yes
Color: Monochrome
Clip Type: Edited
Language: English
Clip: 65675052282
Concrete buckets suspended by cables are dropped on ground at Boulder Dam (Hoover Dam) construction site, Nevada.

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.

Location: Nevada United States USA
Date: 1936
Duration: 4 min 15 sec
Sound: Yes
Color: Monochrome
Clip Type: Edited
Language: English
Clip: 65675052283
Giant pipe units fabricated at Babcock and Wilcox Mill for Boulder Dam construction, Nevada.

The construction of Boulder Dam, later renamed as the Hoover Dam. Exteriors of Babcock and Wilcox Mill near Boulder Dam construction site, Nevada. Steel sheets manufactured. Technicians and workers work with equipment. Pipe units are made from sheets after shaping the sheets. Worker welds sheets. Man work with equipment during laboratory tests. Men work with huge pipe units. High capacity cranes swinging pipe unit. Giant lathe used to join individual sections of pipe units. Pipe section ready for insulation. Tractor trailer carrying a giant pipe unit on road. Pipe unit on Canyon rim, exactly over the dam site. Pipe unit is maneuvered for loading into the Canyon. Man at control tower of the cable way on cliff. Pipe unit transferred through cable ways. Pipe lowers into the canyon. Pipe units taken into tunnel.

Location: Nevada United States USA
Date: 1936
Duration: 7 min 54 sec
Sound: Yes
Color: Monochrome
Clip Type: Edited
Language: English
Clip: 65675052284
A train passes through mountainous terrain in Gunnison National Park of Colorado.

In final year of passenger operations, a Denver and Rio Grande narrow guage railroad train is seen traveling through Black Canyon in Gunnison National Park, Colorado. Interiors of the train filled with passengers in a holiday mood. Interior of passenger cars is old fashioned. View of ceiling lamps in the car. The train travels along the river and through mountainous terrain. Water springs from a hole in a mountain, creating a waterfall, seen from roof of the train. A river spills over a mountain in a large waterfall. The train crosses a bridge over the river and enters Black Canyon, where it follows the river bed between towering peaks on both sides. The engine of the train belches heavy black smoke as it struggles up a grade crossing a bridge. it continues to follow close to the river. Several fishermen turn to wave at the passengers. Gradually the mountains open wider as the train proceeds on its way.

Location: Colorado United States USA
Date: 1940
Duration: 3 min 29 sec
Sound: No
Color: Monochrome
Clip Type: Unedited
Language: None
Clip: 65675053163
Denver and Rio Grande passenger train passes through Black Canyon of Gunnison National Park in Colorado.

In last year of passenger operations, a Denver and Rio Grande narrow guage railroad train journeys through Gunnison National Park, Colorado. A waterfall in Black Canyon of the Park. The train passes through Black Canyon of Gunnison National Park. River rushes over rocks towards the train's track. The engine of the train belches steam and dense black smoke as it rounds a curve in Black Canyon. .Conductor waves to camera from a car labeled: " Denver and Rio Grande Western." Crewmen lean out of train openings as it crosses bridge over river.

Location: Colorado United States USA
Date: 1940
Duration: 1 min 32 sec
Sound: No
Color: Monochrome
Clip Type: Unedited
Language: None
Clip: 65675053164
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