Original paint trade vintage catalog for THE OBELISK WATERPROOFING COMPANY. Main office was located at 1819 Broadway, New York City, NY. Waterproofing of Exterior Surfaces of Stone, Brick and Stucco Buildings Treated with the Caffall Process, also known as the Heat Method. The process is paraffin and creosote dissolved in turpentine, a treatment known as the Caffall Process, named after the inventor Robert M. Caffall. Discussed how masonry walls leak, repair and restore using the Heat Method. Unbound from a large 1938 architectural catalog, this unique old one page technical specifications brochure would display wonderful matted and framed. A terrific addition to your retro waterproofing system library.