Original laboratory trade vintage catalog for R. W. SPARLING, main office was located at 945-951 North Main Street, Los Angles, CA. Manufacturers of Main Line Water Meters, Recording, Totalizing, Indicating. Porcelain enamel pedestal type case, Rate of flow Indicator with Wall Type Cabinet are pictured. Unbound from a large 1931 engineering catalog, this unique old one page technical brochure would exhibit beautifully matted and framed. A fantastic addition to your retro industrial instrument collection. Slight damp stain on outer edge.