Adlake Railroad Signal Lamp, The Adlake Non-Sweating Lamp Chicago, Mfg by the Adams & Westlake Co. (Adlake) of Chicago, made w/strength/durability in mind w/heavier steel, large lenses to direct the light beam effectively to convey specific signals to railroad engineers, 2 blue/2 red lenses, embossed The Adlake Non-Sweating Lamp Chicago/1270, c. late 1800s-early 1900s, Exc cond w/age-related paint nicks, H 17 x W 8 in.