Measurement of visibility from the pilot's cockpit on different airplane types
A 1931 technical report from the NASA Technical Reports Server, a government aeronautical study measuring what a pilot can see from the cockpit of several airplane types, written for aviation engineers and designers. Its pictures are grid-based diagrams in pairs labelled flight attitude and ground attitude, plotting the visible sky and ground arcs around the pilot's head as cut-out sections and spherical projections. A designer might borrow the clean polar grid diagrams and the overlapping arc silhouettes as a plain, precise scientific graphic vocabulary.
