Originally contributed by
via an image from Archäologisches Museum Hamburg
Measurements supplied by Michael Schmidt Nissen :
It's 100 cm high, inner diameter at the height of the 4 tuyeres is 41 cm, inner diameter at top is 22,5 cm. Outer diameter at bottom rim is 50 cm.
At 100 cm - it might be almost high enough to allow for a passive air flow.
Beautiful furnace, from the rest of the archaeological block a slag pit type.