Radio transmission and reception. Electromagnetic waves come in contact with antenna. Animation shows electromagnetic waves passing. A tuning coil is placed in antenna for better connectivity. This process adjusts antenna frequency. Diagram shows the tuning coil with a pendulum. The dots traveling on circuit show the frequency of reception. Diagram shows water line and the pebble. The filament circuit heats up. Incoming waves in the grid. Man holds torch in hand and opens it. Coil is placed on each end of magnet. Sound waves reduced from entering the diaphragm.
British Armstrong Whitworth Whitley bomber takes off from grass field and climbs rapidly. The aircraft makes a low-level pass, buzzing the field and pulls up in a steep climb. British soldiers in jeeps, small open trucks, and motorcycles with sidecars fill a road. They cross a small water stream. Officer in the water on a white horse observes. Motorcycles stop in a village, in formation, and all soldiers wave for the camera. (World War II period).
Camouflage engineers at Fort Heath in Massachusetts during World War 2. Aerial view of Fort Heath with its Coastal areas. U.S. Army Corps of Camouflage Engineers builds camouflage for coastal defense battery installations. Engineers build gun emplacement and concealment using fishnets and other material to deceive enemy. They prepare camouflage paint and paint it on a roof. Tree branch brought in by army truck.
Camouflage engineers at Fort Heath in Massachusetts. U.S. Army Corps of Camouflage Engineers look at maps. Housing and other structures camouflaged to resemble installations. A group of engineers builds fishnets. They cut strips and tie them onto fishnet to build a camouflage. Engineers work on machine cutting iron rods, welding and fitting instruments. These iron rods are placed near a bridge. The iron rod structure placed on the ground. Engineers make wooden boxes for camouflage. Camouflage nets placed over a bridge. Buildings, bridges and other neighboring area camouflaged. Engineers tie camouflaged nets with strings and rods. Engineers stand next to artillery. Building next to coastal area. World War 2 era aerial view of Fort Heath with camouflaged areas.
The Bureau of Internal Revenue in Washington DC. Exteriors of the BIR building and sign outside. World War II Secretary of War, Henry L Stimson exits the building. A guard opens the car door and Stimson gets into the car.
The Navy Department in Washington DC. Employees enter the Department. Police officers inspect the employees. Men and women with their photo identity pinned on their coats. They walk through the doors.
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