The 1926 German seaplane contest
A 1928 NASA technical report on the 1926 German seaplane contest, compiled by the NASA Technical Reports Server from an aeronautical research archive for engineers and aviation specialists. Its three pictures are engineering charts: two families of curved and straight lines on gridded graph paper, and a line graph of rating coefficient against test days with numbered traces. A designer could take from them the look of dense technical plotting, with fine ruled grids, dashed and solid curves, and small numeric labels set against the lines.
