Experimental Investigation of the Problem of Surface Roughness
This is a 1937 NACA technical memorandum, No. 823, issued by the National Advisory Committee for Aeronautics and distributed through the NASA Technical Reports Server, reporting experimental work on how surface roughness affects boundary-layer velocity profiles. Its pictures are plain engineering plots: log-scale graphs with straight fitted lines, dotted data points and numbered curve labels on gridded white pages, offering a designer a clean, technical palette of grid lines, scatter marks and hand-drawn annotation.
