"Mitsubishi Signal Lamp" is a signal lamp manufactured by Isomura Sangyo Co., Ltd. from the early Showa era to the 1960s. It was used by railway workers during the Japanese National Railways era to send hand signals. The light color can be switched between red, white, and blue by operating the lever. One wooden knob (decoration) on the top of the lens switching lever is missing, and there is a repaired crack on the blue lens (see the last two photos). A combustion experiment was conducted for this listing. It maintains sufficient light output even today, across the ages. "Mitsubishi" is the Isomura trademark, depicted on a metal label with three diamond shapes. A carbide lamp is a lamp that emits light by burning acetylene gas generated by the reaction of calcium carbide and water. Its vivid and unique color is popular among retro enthusiasts. Carbide can be purchased at fishing tackle stores. Dry weight: 1,440g Dimensions: Bottom diameter 11cm x Total height 34cm Lens section: Diameter 10cm Maximum width: 17cm *The carbide stone case in the photo is not included.