The balance of moments and the static longitudinal stability of airplanes
A 1929 NASA technical report on aircraft balance of moments and static longitudinal stability, written for aeronautical engineers and aircraft designers as a technical record rather than a popular book. Its pictures are dense engineering charts of wing lift coefficient, centre of gravity location, moment coefficient, and tail aspect ratio plotted as crossing lines and grids, with little ornament; a designer might take from them the plain, diagrammatic vocabulary of data graphs and coordinate grids.
