Performance of a vane driven-gear pump
This is a 1921 NASA technical report on the performance of a vane-driven gear pump, issued as an engineering document for aeronautical engineers and researchers. Its pictures are plain line graphs on squared grids plotting efficiency, drag and horsepower against air speed in miles per hour and delivery against speed in revolutions, with solid, dotted and dash-dot curves labelled by test condition. A designer might take from them only the restrained chart conventions: tidy axis labels, a limited palette of line styles and generous grid spacing.
