1 : 31680 The Ordnance Survey took particular care in plotting the south coast of England, as this was the area most immediately vulnerable to invasion. This plan notes military barracks at Selsea, Aldwick and Bognor to the bottom right of the plan. Buildings are blocked in red and black ink and infilled at Chichester, in the centre of the plan, and Arundel, at the right. A poor house and pest house are located a considerable distance beyond the boundaries of Chichester.
This is a map of Hampshire by Christopher Saxton, datingfrom 1575. It forms part of an atlas that belonged to William Cecil Lord Burghley, Elizabeth I’s Secretary of State. Burghley used this atlas to illustrate domestic matters. This map is actually a proof copy of one which forms part of Christopher Saxton’s Atlas of England and Wales. This atlas was first published as a whole in 1579. It consists of 35 coloured maps depicting the counties of England and Wales. The atlas is of great significance to British cartography as it set a standard of cartographic representation in Britain and the maps remained the basis for English county mapping, with few exceptions, until after 1750. During the reign of Elizabeth I, map use became more common, with many government matters referring to increasingly accurate maps with consistent scales and symbols, made possible by advances in surveying techniques. Illustrating the increasing use of maps in government matters, Lord Burghley, who had been determined to have England and Wales mapped in detail from the 1550s, selected the cartographer Christopher Saxton to produce a detailed and consistent survey of the country. The financier of the project was Thomas Seckford, Master of Requests at the Court of Elizabeth I, whose arms appear, along with the royal crest, on each map. Lord Burghley added several place names to the map. This map was engraved by Leonardus Terwoort, one of a team of seven English and Flemish engravers employed to produced the copper plates for the atlas. Saxton, Christopher Terwoort, Leonardus Antverpianus
1 : 21120 Triangulation allows the relative location of individual topographical features to be plotted accurately. This drawing shows the primary triangulation of southern England, the lengths of the sides of each triangle being noted. Stations shown include Dunnose, Bagshot Heath, Inkpen Hill and the Salisbury Plain base. The points of the triangles provided the surveyor with references to which, by measurement or angular observation, he could precisely relate the position of other topographical features. Angular observations were made using a theodolite. Triangulation points were carefully chosen. Elevated sites were preferred where possible, particularly the tops of hills and church towers.