Two mechanics pose near the entrance of Langley's first wind tunnel.
In this historical photo from the U.S. space agency, Langley's first wind tunnel is pictured. The honeycombed, screened center of this open-circuit air intake for the wind tunnel insured a steady, nonturbulent flow of air. Two mechanics pose near the entrance end of the actual tunnel, where air was pulled into the test section through a honeycomb arrangement to smoothen the flow.
The National Advisory Committe on Aeronautics (NACA) was a precursor to NASA. NACA was created by Congress in 1915.
Each weekday, SPACE.com looks back at the history of spaceflight through photos (archive).