Pencil lines radiating from trigonometrical stations cover this drawing. They show the angles used for measuring distances and plotting topographical features. To the left of the map on Chestnut Common, the word 'flag' denotes the site of such a station. Hoddesden Park Wood and surrounding woodland are shown by individual trees with a line at the base, indicating shadow. This laborious technique was often replaced by a more generalised, stippled representation of treetops. The Lee River, running from Standstead at the top of this drawing, branches to form a canal leading down to the Powder Mills, which manufactured Gun Powder for shipping to London. Locks on the canal are shown in red
Triangulation lines radiating from fixed points are clearly visible on this map. A pecked red line running adjacent to Lee River marks the boundary separating Essex from Hertforshire and Middlesex. Henhault Forest is shown by a stippled canopy of tree tops at the centre of the drawing. Perhaps the most interesting detail on this map is just south of the forest: a small drawing of a tree inside an enclosure marked 'Fairlop Oak'. This giant oak tree was something of a local landmark. In 1791, William Forsyth, gardener to George III, made unsuccessful attempts to halt the tree's decline. The year that this map was published, the tree was badly burnt by a fire started during a picnic. Its health steadily continued to wane until it was blown down in a gale in 1820. The inclusion of details such as the Fairlop Oak reveals the meticulous nature of the Survey, and the great attention paid to local detail.
1 : 31680
The individual settlements that make up this area of London are shown by red blocks, with boundary lines indicating the fields separating them. Shading and soft interlining indicate relief, neatly illustrated at Primrose Hill, the summit of which is left bare. The barracks at the edge of Hyde Park are illustrated at the very bottom of the map. The dark blue-black line running from West Drayton to Brentford and Paddington is the Grand Junction Canal. This was London's principal link to the rest of Britain's canals, allowing the passage of goods to and from the industrial towns of the North and Midlands. Hyett includes a ground plan of Kenwood House in Hampstead, showing a level of detail much greater than might be expected from a map with a scale of two inches-to-the-mile.