The vertical wheel is the type most commonly associated with Irish milling tradition, a design in which the wheel is turned by water striking its paddles either from above, below, or at mid-height, converting the flow of a stream or millrace into rotational force to drive the grinding stones inside. That a structure of this kind was built and operated here at all speaks to the slow, practical logic of rural Connacht, where fast-flowing water was channelled and put to work wherever local topography allowed.