North American experimental unmanned X-10 aircraft sitting on runway at Edwards Air Force Base, California, United States. It displays conventional tricycle landing gear, canard at nose, and twin tail. It is powered by two Westinghouse J-40 turbojet engines, whose intakes are visible on both sides of the fuselage. Aircraft seen during computer-controlled takeoff roll with fairly steep nose attitude. View of it breaking ground, in about 20 degree nose up attitude, with landing gear still extended. Cloud of dust left on ground behind the aircraft. The X-10 in flight, cleaned up, with gear retracted. A chase plane seen below and behind, briefly. The X-10 coming in for landing with landing gear extended. It touches down in nose high attitude, creating dust trail and slowly lowers to have nose gear contact ground, and a drag chute deployed.
Picturesque views of the 1919 U.S. Army motor transport convoy making its way through the beautiful forests of the Sierra Nevada mountains in California. Tall evergreen trees and dramatic mountain views frame many pictures of the convoy. The convoy stopped at Kybury, California, for dinner.
View of meadows and Sierra Nevada mountains in Yosemite Valley. Mine structures. View of snow covered mountain peaks and slopes. River runs through the mountain ranges.
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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