Original laboratory trade vintage catalog for PALMER COMPANY, was located 226 Clay Street, Cincinnati (St Bernard), OH. Manufacturers of Red-Reading Mercury Indicating Industrial Thermometers. Pure Mercury tube which shows a bight red color in the reading column, instead of the silver mercury color. Chemical Thermometers for laboratories, testing departments. 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.