The protection of structural metal.
A 1912 trade catalogue issued by the John T. Lewis & Bros. Co. of Philadelphia, a paint and coatings maker, aimed at architects, builders and engineers specifying protective finishes for structural steel. The pictures are grey halftone-style architectural views of large brick and stone buildings with early automobiles and horse carriages on the street, which suggest period urban street scenes and sturdy masonry-and-steel commercial architecture for a designer's reference.
