Aeromechanical experimentation (wind tunnel tests)
This is a 1929 technical report from the NASA Technical Reports Server on aeromechanical experimentation, covering wind tunnel tests. The two pictures are lettered line drawings of experimental apparatus. One shows a sectional view of a test enclosure with labelled parts, and the other shows a long tapering duct on wheeled carriage inside a shed with a fan and arrows indicating airflow. A designer might take from them the clean, labelled schematic style of early engineering diagrams.
