End of World War I. 1920: Franklin D Roosevelt along with an official walks on White House grounds, with Old Executive Office Building in background. . A group of officials comes forward, shakes hands the official and Roosevelt.
Film titled 'Underwater Sentries'. U.S. Coast Artillery troops board a Destroyer Minelayer (DM). Stacked underwater mines in the foreground. DM leaves the dock. Sailors aboard the DM handle mines. Coils of wires on the deck. Sailors on a boat prepare distribution boxes. Cable is connected between the DM and the boat. Mines armed and cables connected from mines to distribution boxes that control firing. Mines are laid by the DM. Animation shows the laying of mines by the DM. (World War II period).
Ground mines aboard a Destroyer Minelayer (DM) underway in harbor. Ground mines planted in the harbor. Cover of ground mine is opened and cable to the distribution box is attached. A crane lowers the mine into the water. Cables connected from mines to distribution boxes that control firing. Distribution box is lowered in water. Animation shows the laying of ground mines by a DM. View of switchboards in the central control station at the harbor. Demonstration of reports received, interpreted and acted upon. Enemy vessels are destroyed. Huge explosions in water (World War II period).
American wearing hat and bow tie makes a statement to reporter. He talks about war being imminent in Europe (World War II) and an increasing interdependency between nations of the World. He highlights that aircraft air power will have a massive impact in any future conflict and that a powerful defense force is vital for a nation to make its stand in the world.
Wind tunnel test of a wing design, the "Davis Wing" designed by aeronautical engineer David R. Davis. Animation shows the flow of wind around a wing of the plane. View of a model-plane at the mouth of the wind tunnel.
Slate reads: "How the Wrights learned to fly -- the motorless, man-carrying glider."A primary glider is seen, circa 1922. A group of people, at the top of a high hill, overlooking a valley, watch as the glider with skeleton frame,single high wing, and wheels, launches from the hilltop. It is operated by a single pilot who maneuvers it on a long flight toward the valley below.
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