The new French high-speed wind tunnel
This is a 1923 technical report from NASA's Technical Reports Server describing a new high-speed wind tunnel built in France, presented as engineering documentation for aerodynamic researchers. The three pictures are engineering drawings: a sectional elevation of a tunnel nozzle with a track bridge and sliding door, a second nozzle section with internal fittings, and a front view of a propeller-driven fan with couplings and reinforced concrete sections. A designer could take from them the clean, labelled line-drawing style of early engineering diagrams, with dimension letters, hatching and cutaway views.
