Wooden patent model by L.C. Allin for bronzing gun barrels. Measures 6.5" in length by a width of 3". Two hinged door closures are located on top of the model. Two windows located on the side of the chamber. Inside the chambers would be the location of the steam pipes or coil that was used to control the environment within the chamber. Wheels located inside the chamber would get an even distribution of browning. Patent 151,647 to improve the process of bronzing barrels was filed on January 20, 1874 and granted on June 2, 1874.
Very good condition overall. Minor scratches to the wood.
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