Original insulation trade vintage catalog for SPECIALTY CONVERTERS, INC. was located at 161 East Erie Street, Chicago, IL. Manufacturers of Silvercote Reflective Insulation Board. Heat travels in three ways. Conduction, Convection, Radiation. Unbound from a large 1938 architectural catalog, this unique old six page technical brochure would exhibit beautifully matted and framed. Nice cover graphics. A fantastic addition to your retro insulation collection.