White coal
From Wikipedia, the free encyclopedia
White coal is a form of fuel produced by drying chopped wood over a fire. It differs from charcoal which is carbonised wood. White coal was used in England to smelt lead ore from the mid-sixteenth to the late seventeenth centuries. It produces more heat than green wood but less than charcoal and thus prevents the lead evaporating.[1] White coal could be use mixed with charcoal for other industrial uses than lead smelting.[2]
White coal was produced in distinctive circular pits with a channel, known as Q-pits. They are frequently found in the woods of South Yorkshire.
The term is also used to refer to Hydroelectricity. [3]
White coal is also made from Ground nut husk.
[edit] References
- ^ Rackham, Oliver (2007). The New Naturalist Series. Woodlands. London : Collins. ISBN 978-0-00-720244-7. p. 205.
- ^ Muir, Richard (2008). Woods, Hedgerows and Leafy Lanes. Pub. Tempus, Stroud. ISBN 0-7524-4615-8. pp. 91 - 92.
- ^ The Book of Knowledge. Vol. 9 (1945 ed.). p. 3220.
