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The ring furnace is the forerunner of modern tunnel kilns as continuous furnaces. The stove was invented in 1839 in Fürstenwalde. The ring furnace consists of a main fire passage surrounded on each side by several small rooms. Each room contains a pallet of bricks. In the main fire passage there is a fire wagon, that holds a fire that burns continuously. Each room is fired for a specific time, until the bricks are vitrified properly, and thereafter the fire wagon is rolled to the next room to be fired.The continuous firing provided for the first time a constant quality of the bricks which they looked different before. In addition, the ring kilns burned continuously for the first time day and night, which led to a sudden increase in the demand for labor, but at the same time enabled a previously unknown increase in brick production.