This oil-wick cap lamp was made by an unknown maker during the second half of the 19th century. The oil-wick cap lamp was first invented in Scotland in 1850 and in use until the 1920’s. The font contained a mix of fat and oil for fuel, and a wick was inserted into the spout. The resulting flame was much brighter and more efficient than the candles it replaced. The tag calls this a “boss lamp,” and the hook on this lamp is larger than most, and was likely used to hold the lamp rather than hook it onto a cap.
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