What makes it particularly striking is the nature of the machine itself: not the familiar vertical waterwheel of later centuries, but a horizontal mill, one of the oldest forms of water-powered milling known in Ireland.

The find came to light in 1848, when drainage works were carried out at Milverton Demesne in County Dublin. As the ground was opened up, several clay dams were exposed along with a millshaft into which eight large wooden spoons had been morticed, meaning fixed into cut slots. Those spoons were the paddles of a horizontal wheel, designed to sit flat in a stream and be spun directly by the force of water striking the blades, without any need for gearing or conversion of motion. Two small grindstones were recovered alongside the shaft. The details were recorded by O'Donovan in 1859 and later drawn on by A. T. Lucas in his 1953 study of Irish horizontal mills, which remains one of the key references for this type of site. Horizontal mills were common in early medieval Ireland, where they suited the relatively modest water flows of smaller rivers and streams, and required less engineering complexity than a vertical-wheel system.

The site is not precisely located, which is the central difficulty for anyone hoping to find it. Milverton Demesne lies in north County Dublin, but no exact coordinates or field markings are recorded in the available sources. What a visitor can reasonably do is treat the surrounding landscape with some curiosity, knowing that the drainage works of the mid-nineteenth century disturbed ground that had preserved this machinery for many centuries. The grindstones and shaft are not known to be on public display, and the physical site itself offers nothing visible above ground. The interest lies mainly in the fact of it, and in what the clay dams and carved wooden spoons suggest about the daily working life of an early Irish community that once relied on this small, practical machine.