Wings with Nozzle-Shaped Slots
A 1929 aeronautical technical report from the NASA Technical Reports Server, a research paper on wing design that uses diagrams and plotted measurements to study airflow over slotted wings. Its pictures are engineering graphs, velocity-vector sketches, and a wing cross-section, drawn in plain black line on grid paper. A designer might take from them the clean, schematic way technical data is charted, with numbered curves, labelled axes, and simple arrow-based flow diagrams.
