Digital Images Archive
98. Six-inch Portsdown Hill and Hilsea sheet 1, 1914 (CCS 218B/49/9)
This pair of special six-inch sheets were prepared by the Ordnance Survey for War Department use. The full range of the Palmerston forts and the Hilsea Lines defensive systems north of the Portsmouth naval base are shown. There are contours in blue at one hundred feet intervals. One function of the the map was to act as an index to special sheets at a larger scale, presumably 1:2500.
From copies now transferred to Cambridge University Library