Might this be because of wind conditions and draft from the flue to the
>Mitch Warburton is enquiring if anyone knows the purpose of a recess at
>the base of an industrial mine chimney.
>For diagram and photographs please go to the URL below and click on the
>XML link or the Quick Link Site Map on Page 2.
>http://www.cmsmrps.org.uk - a community archaeology initiative.