172
Primitive Technology: Volute Shaped Blower
(www.youtube.com)
For sharing interesting videos from around the Web!
Did you not think of the possibility of making one?
The dude has bricks, charcoal, twine and all sorts of things that he's made that don't "grow on trees". I don't think the idea of carving a gear from wood or even trying to cast one in ceramics is an impossible idea.