Investigation of air flow in open-throat wind tunnels
This is a 1930 NASA technical report on airflow in open-throat wind tunnels, presented as a series of test charts and sketches of nozzle and exit-cone geometry. The pictures are graphs of dynamic and static pressure against distance from the entrance cone, paired with traces of the tested flare and exit cone shapes. A designer might take from them the sparse, grid-based plotting style of early engineering data and the clean linework of the cross-section diagrams.
