German aeronautical scientists testing radio directional finding network, shortly before World War 2. Men opening partition slide of a barn that serves as their laboratory. Small dish-shaped antenna in barn and large search antenna on ground. The two scientists in white lab coats set up radio equipment. Towers and snow-covered field in the background. Wire hanging over a scientist setting up radio. A biplane aircraft marked “DEUTSCHE LUFTREEDEREI (German Air Transport)”, with rear cockpit enclosed. A Junkers W 33 (D-1957) transport aircraft with wheel gear instead of floats carrying electronic gear. The Junkers W 33 has visible external antenna. Aerial view of the Junkers W 33 in flight. Two men with radio antenna of a Dornier Do X flying boat. Dornier Do X flying boat aircraft in water is seen as it taxis away from dock and then in flight low over water.
A large formation of Henschel Hs 123 dive bomber aircraft in flight. A formation of Dornier Do 23 medium bombers flying over Germany. Nazi Swastika on empennage of the bombers is seen. A low angle view of German Dornier Do 23 bombers and Junkers Ju 52 transport planes in flight overhead.
A German Aeronautical research facility in Germany, before World War 2. Materials testing machines inside the research facility. Technicians turning crank handle of a cylinder test machine. A machine with coils. Various gauges and valves of a machine. Gauges measuring the speed of engines. A multi-cylinder pulse machine. A Tacho Waage speedometer. Scientist inspects machine. Smoke rises from large chimneys beside towers. A soundproof engine test building. A propeller running on high speed inside the soundproof engine test building to test engine reliability.
German Aeronautical research facility in Stuttgart, Germany before World War 2. German technicians opening doors on top of aircraft engine test room. Propellers run on high speed during engine tests. A technician opens door. A large machine that runs engine tests. Technicians operating test consoles. A Tacho Waage speedometer measures engine test speed.
German technicians inspect a large machine cylinder inside a German Aeronautical materials testing laboratory, pre World War 2. An engine being lowered on the altitude test bench. Technicians inspect various gauges. Gauges measuring air pressure while testing an engine.
A materials testing laboratory in Germany, before World War 2. Technicians working on aerodynamic research for aircraft applications inside laboratory. A scientist subjects a test rod into a machine. Technician reading gauges and speedometers. A test rod breaks during test. Machine tests the strength of metal.
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