Original metal trade vintage catalog for NORTH WESTERN EXPANDED METAL COMPANY. Main office and plant was located at 915-953 Colony Building, Chicago, IL. Manufacturers of Econo and Chanelath ribbed metal lath. The Econo is a reinforcing fabric made from a high grade sheet steel, using various gages from 18 up to 4. Detail of mesh, application and size of mesh is supplied. The Chanelath is composed of a series of heavy cold formed steel T-ribs connected together by the ideal mesh known at Kno-Burn. The application, sizes and table of safe loads for square foot are provided. Unbound from a large 1916 architectural catalog, this unique old two page technical specifications brochure would display beautifully matted and framed. A fantastic addition to your retro metal library. Pages are detached and contain a small amount of residual glue on edge.