Welding Rustproof Steels
This is a 1929 technical report from the NASA Technical Reports Server on welding rustproof steels, issued for metallurgists and engineers studying weld structure. The three plates show close-up photomicrographs of etched steel surfaces with captions such as Fig. 8, presenting grain patterns that range from fine speckled textures to coarse streaked and crystalline fields. A designer might take from them the look of metal grain, etched surface texture and crystalline pattern as raw material for abstract backgrounds.
