Somewhere down south was a co. that made water wheels of steel until ww 2 or later. Along the St. Lawrence river on the Canadian side is old Canada village. In season they operate a water powered sawmill, an up and down, direct connected to some kind of tub wheel. It is a cross between a turbine and water wheel, I really don't know the proper name for it. It sits in the raceway that has one hell of a flow below a big pond. This mill is quite a show.