Signal tower, Islandhubbock, Co. Waterford

At Ballyvoyle Head on the Waterford coast, there is no tower to see. No ruin, no stump of masonry, not even a reliable fix on where the building once stood. What remains is essentially a cartographic ghost: a point on the clifftop, about 74 metres above sea level, where a signal station was erected by 1805 and demolished so thoroughly and so early that the Ordnance Survey mappers of the late 1830s found nothing worth recording. The nearest clue is an orphaned trigonometry point on that first-edition six-inch map, sitting roughly 50 metres from a large L-shaped building that had itself vanished before the twenty-five inch survey of around 1901. Larkin's 1818 map of County Waterford does show it, labelled simply "Telegraph," which is about as much of a physical record as survives.

The tower was one of over 80 signal stations built by the British Board of Ordnance between roughly 1804 and 1805, strung in a continuous chain from Dublin Bay clockwise around the entire Irish coastline to Malin Head in Donegal. The purpose was straightforward: to relay warnings of an approaching French invasion fleet using naval signal posts, each station within visual range of the next. The Ballyvoyle Head station sat between Mine Head to the west-southwest, about 10 kilometres away, and Bunmahon Head to the east-northeast, about 8 kilometres distant. Both of those are also now demolished. When the threat of French invasion faded in the mid-1810s, the whole system was abandoned. In Waterford, however, the towers came down with unusual speed: five of the county's six stations were gone before the first Ordnance Survey maps were made, a pattern that sets Waterford apart from most other counties on the chain. The likely reason was recorded in writing in 1811 by a Mr Pope, Waterford agent of the London Assurance Company, who complained that derelict signal towers were being mistaken for lighthouses by mariners in poor weather, contributing to a series of shipwrecks near Tramore around 1810. The towers, he argued, were more dangerous standing than they had ever been useful. One station near Tramore, probably at Brownstown Head, was pulled down before the end of 1811, and it seems the others, including the one here at Ballyvoyle Head, may have followed for the same reason.