Ferrie's Furnace

“A peculiar furnace, known as Ferrie’s self-coking furnace after the name of its inventor, in which raw coal is employed, has been used at the Monkland Iron Works and elsewhere during the last few years. On the top of an ordinary furnace of about 53 feet in height and 7000 cubic feet capacity were erected four chambers or retorts about 20 feet in depth, each having a capacity of 500 cubic feet; external flues, in which a portion of the waste gases were burnt, served to heat these chambers in such a way as to coke the raw coal.” — The Encyclopedia Britannica, 1893

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