Oil pot lamp
Between around 1890 and 1915 glass lamps that were holders for oil pot lamps such as the "gone with the wind" lamps, vase lamps and fancy parlor hanging lamps became very popular among the expanding American middle class. These lamps came with a standard size oil pot lamp fitted with a round wick burner. When fitted to the lamp only the top part above the chime ridge was visible. Makers of mantle lamps offered mantle lamp oil pots as a lighting upgrade to those lamps.
Mantle lamps manufactured by the Miller Mantle Lamp Department offered this version based upon the tooling used for the Miller round wick oil pot lamps.