Man in Space
A National Historic Landmark Theme Study
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Variable Density Tunnel
![Variable Density Tunnel](images/space1b.jpg)
Exterior view of VDT in Building 582, 1929.
(Photo by NACA, NASA/Langley Research Center Archives)
![Variable Density Tunnel](images/space1c.jpg)
Modern exterior view of VDT in Building 582, 1984.
(Photo by NASA, NASA/Langley Research Center Facilities Office)
![Variable Density Tunnel](images/space1d.jpg)
Diagram of Variable Density Tunnel
(Source: Wind Tunnels of NASA, Donald D. Baals)
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Variable Density Tunnel
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