Dā'na-īde, n.

(44), n. (Mach.) An hydraulic machine, belonging to the class of horizontal wheels. It consists essentially of a vertical axis, having two conical cases attached, one within the other, the space between them being divided by plates placed radially so as to form conduits for the water to pass from top to bottom. The water enters in a jet at the top of the cone, as nearly as possible tangential to it, and imparts motion to the wheel by its momentum.