The use of slots for increasing the lift of airplane wings
This is a 1931 NASA technical report on aircraft wing slots, compiled by the NASA Technical Reports Server from aeronautical research of the period and aimed at aerodynamicists and engineers. The plates are graphs of lift coefficients against angle of incidence and drag, with a few airfoil cross-sections drawn above them, showing how slotted and unslotted wing profiles compare; a designer might take from them the clean plotting conventions and the labelled curve families of early engineering data.
