6e2549b8_DARC_Iron_Smelting___Oct_2004__Notes
[Absolute Time] 1532h [Elapsed Time] T+0:26 [Notes] 
On this base we built a circle of 9 firebricks standing on end (this produced a rough circle 22.5 cm deep and 27cm across). The hole was then backfilled with soil and tamped into place.
DARC Iron Smelting - Oct 2004
Notes