The Charles Close Society for the study of Ordnance Survey maps

Digital Images Archive

91. One-inch Third Edition (Large Sheet Series) sheet 115, with military grid (CCS 218B/49/2)

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This is one of a few one-inch sheets overprinted during the first world war with military grids in the style of those in use on the western front, presumably for artillery training purposes. This sheet is overprinted in red with a six-mile and quartered one-mile grid. The principal squares are lettered A to O, the one-mile subdivisions 1 to 36, quartered a to d. The origin is in the north-west corner, with grid lines parallel to the sheet lines of the map. The grid line at the outer edge of the six-mile squares around the edge of the sheet is present (see no.93).

From a copy in a private collection