Jet propulsion for airplanes
This is a 1924 technical report from the NASA Technical Reports Server, a government-era aeronautics study of jet propulsion for airplanes, written for engineers and aircraft designers. Its two pictures are engineering line graphs: one plots a ratio P/Ts against speed in miles per hour for curves labelled 100 to 350, and the other plots temperature in degrees Fahrenheit against a horizontal scale for three labelled curves t1, t2 and t3 at two conditions, +90 and -30 degrees. A designer might take from them the plain, restrained look of early scientific charts, with clean grids, labelled curve families and minimal ornament.
