Tub wheel

Also found in: Wikipedia.
a horizontal water wheel, usually in the form of a short cylinder, to the circumference of which spiral vanes or floats, placed radially, are attached, turned by the impact of one or more streams of water, conducted so as to strike against the floats in the direction of a tangent to the cylinder.
- Shak.

See also: Tub

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
"Stone grinding wheels were used, turned by a water wheel laid on its side, called a tub wheel. They let the water wheel operate continuously in real cold weather so it would not freeze.
A landing lad's days would have been long and solitary considering he would have to stop the sets of tubs - travelling at 10-15mph without brakes - with the use of "dregs" which were nothing more than iron bars thrown between the spokes of the tub wheels.