Tin soldering of aluminum and its alloys
A 1921 technical report from the NASA Technical Reports Server, catalogued under its title on tin soldering of aluminum and its alloys, presumably written for engineers and metalworkers. Its two pictures are patent-style line drawings: a tall lattice truss marked Fig. 3 and Fig. 4 beside a close-up of a four-way tubular joint with a spherical hub, both rendered in fine black linework on a pale ground that a designer could borrow for structural or technical diagrams.
