Technical Progress Shown in the 1927 Rhon Soaring-Flight Contest
A 1928 NASA technical report on the 1927 Rhön gliding competition in Germany, issued for aeronautical engineers and researchers to document progress in soaring flight. The pictures are plain line drawings and a photograph of glider wings, tails and fuselages with dimensions labelled in feet and metres, so a designer could take their clean schematic layout and dimension callouts as a model for technical diagram styling.
