A Jander consists of three main parts:
1. The fan (operated by water flowing from an elevated point).
2. Millstones (two large wheel-like structures that rotate on an axle and can weigh up to a ton. They are rotated by the fans).
3. The cone (used to funnel grain between the millstones for grinding).
jaaaaaaaaaaarl!
http://es.wikipedia.org/wiki/Jarl