Editing Lime kiln (section)

=== Types of kilns ===
[[File:Tamsalu rõngasahi 2021.ogv|thumb|Drone video of ruins of limestone ring kiln at Tamsalu, Estonia 2021]]

Permanent lime kilns fall into two broad categories: "flare kilns" also known as "intermittent" or "periodic" kilns; and "draw kilns" also known as "perpetual" or "running" kilns. In a flare kiln, a bottom layer of coal was built up and the kiln above filled solely with chalk. The fire was alight for several days, and then the entire kiln was emptied of the lime.

In a draw kiln, usually a stone structure, the chalk or limestone was layered with wood, coal or coke and lit. As it burnt through, lime was extracted from the bottom of the kiln, through the draw hole. Further layers of stone and fuel were added to the top.<ref>{{cite web |last=Smith|first=Nicky|title=Pre-industrial Lime Kilns |url=http://www.english-heritage.org.uk/publications/iha-preindustrial-lime-kilns/preindustriallimekilns.pdf |work=Introductions to Heritage Assets |publisher=[[English Heritage]]|access-date=21 April 2013|date=May 2011}}</ref><ref>{{cite web |last=Siddall|first=Ruth|title=Kiln Architecture and Technology|url=http://www.ucl.ac.uk/~ucfbrxs/limes/Kilns.htm|work=Materials Science|publisher=University College, London|access-date=21 April 2013}}</ref>