The Funck-Heap Lamp

This lamp was introduced in 1892. It was the standard lamp that was used in the 4th Order lenses in many lighthouses. It was a standard "Argand lamp" with a single 1 1/8 inch wick.

With a few alterations, the same lamp was used for the 5th and 6th Order lamps.

This information on the Funck-Heap Lamp was given by the U.S. Lighthouse Society.