This 20-minute video, shows our experimental iron smelting and how a
small 2' chimney can replicate a medieval/colonial iron furnace. Hosted
by Dr. Steven A. Walton, a professor of the history of science and
technology at Penn State, you can see the results of our iron smelting
in October 2006. Smelting is surprisingly easy and quite safe (it is no
more fiery than a campfire and is quite contained) and if you want to
try it yourself, you can find plans and a report on our experiments
here.
There are also lots of photos here.