Manometer for recording air speed
A 1922 technical report from the NASA Technical Reports Server describing a manometer for recording air speed, a scientific instrument document rather than a general book. Its two pictures are dynamic-pressure traces plotted in kilograms per square metre against time in seconds, showing a sharp rise at landing or start, fluctuating plateaus and a tapering decline. A designer could take from them a sparse, hand-plotted graph vocabulary with ragged line work and minimal axis labels.
