1822: Enclosed coal-fired flares

It was difficult to control the open coal-fired flare.As long as the fire-vat was exposed to the elements this affected both the blaze and coal consumption.

In the late 1700s several trials were carried out in Europe with placing the fire-vats inside a protective lantern house in order to control firing.The results proved that coal consumption could be halved.
Both Lindesnes and Markøy were therefore re-built in 1822 according to Poul Løwenørn’s plans.

It must have been both hot and smoky inside the lantern rooms, where it was said that watchmen fainted due to carbon monoxide.That may be why the Supervisor continued to use the signal cannon on Selhovden Island.