The 1929 Rhon soaring-flight contest
A 1930 NASA technical memorandum reporting the 1929 Rhön soaring-flight contest, its record is a government aeronautical report rather than a trade book. The single plate, a grid of photographs captioned Fig. 3 to Fig. 16, shows named glider aircraft in flight against hazy skies, with some frames taken from the ground looking up and others from alongside. A designer could take its low-contrast grey photographic tonality, tight plate grid and labelled figure captions as a clean technical reference style.
