A section of the slating was carefully dismantled and the slates' lengths, laps and the lath gauges were measured at each course. Most of the slates had slipped out of place. But by digitally moving them back into position in a photograph it can be seen that the slating has been set out in three and a half pin gauge. This is a technique which is well known in Devon and Cornwall and has been conserved. But on roofs In Wales they have almost always been simply discarded and replaced with modern slating. The majority of the original slating is in 11 inch / 279 mm long slates with just a few courses of 12, 13 and 14 inch (305, 330, 356 mm) slates at the eaves.