Riveting in metal airplane construction. Part III : strength of riveted joints in duralumin (continued)
This is a 1930 NACA technical memorandum from the NASA Technical Reports Server, a government aeronautical research report on riveting in metal airplane construction, written for engineers and aircraft designers. Its photographs show duralumin test plates with punched and riveted holes, photographed after tests, with the plate thicknesses labelled in each figure caption. A designer might take from them the clean, grid-like arrangement of small square specimens shot against plain backgrounds, with the holes and tearing shown as high-contrast forms.
