The Charles Close Society for the study of Ordnance Survey maps

Digital Images Archive

One-inch (1:63,360) map of Ireland sheet 49

69. The '1” provisional edition for military purposes only' of Ireland was apparently initiated in 1915. Special features incorporated as required by the War Office were the division of the border into two-inch alpha-numeric blocks, no doubt for referencing purposes, magnetic variation data, and contours overprinted in red. The number of sheets recorded even now is still in single figures, and there is no record of whether the map had national coverage, or merely of areas of interest to the military. In the preparation of the one-inch map of Northern Ireland, GSGS 3917, in 1932, the Ordnance Survey in Southampton reused the red contour plates made for this edition, insofar as they existed.

From a copy now donated to the Charles Close Society Archive – CCS L24/38