Attaining a steady air stream in wind tunnels
A 1933 NASA Technical Reports Server publication, apparently a technical translation or report on achieving smooth, steady airflow in wind tunnels, aimed at aerodynamics engineers and researchers. The pictures are line drawings and graphs: tunnel cross-sections and nozzle contours, a honeycomb forming roller, sheet-metal flap detail, deflecting vane layouts in a wind tunnel roof, and a propeller-type fan diagram, with a performance curve. A designer could draw on their clean, precise technical linework and the schematic diagram conventions of the period.
