Steelworker, Volume 2 (NAVEDTRA 14251)
by U.S. Navy (Naval Education and Training Command) · Internet Archive
U.S. Navy nonresident training manual covering layout and fabrication of sheet metal duct, structural steel and pipe, plus rigging, reinforcing steel and shop tools. The single best free text match for this topic's stated scope: Chapter 2 is layout and fabrication of sheet metal, Chapter 3 is structural steel terms plus layout and fabrication of structural steel and pipe. It teaches parallel-line and radial-line pattern development, structural shape designation, fit-up and assembly sequence - not a summary or listicle. Public domain, 416 pages, with pattern development and structural-shape terminology worked step by step.
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