South Petherwin, Cornwall
A triangulation diagram covers this whole drawing. This was used to plot the location of significant features around which other topographical details could be added., Trigonometric altitudes are recorded at the summit of inclines, while short disconnected lines are drawn in blue watercolour to represent relief - a technique known as 'hachuring'.,Several archaeological sites are recorded on this drawing, although this did not become obligatory until 1816.,In the lower section of the map to the left of Upton, a darkened triangular point is marked,'Cheese Wring'.,Below this is a stone circle named 'The Hurlers'.,Field boundaries are marked, with darker lines indicating the division between cultivated and uncultivated land.,A table of figures appears in pencil,to the lower right of the drawing.,Sealing wax is apparent on the reverse.,The paper is watermarked W. ELGAR 1796., Dawson, Robert
The border between Devon and Cornwall is shown running along the River Tamer from Horse Bridge to New Bridge., Mining is evident around Peter Tavy to the central right of the picture, while Mill Hill Slate Quarry is prominent in the middle of the region., There are more quarries just above Sampford Spiny, to the bottom right of the map., At the topmost point is Brent Tor, with the Church of St Michael enclosed by a red boundary signifying a stone wall., Authorship is unconfirmed.
This drawing of the area around Launceston in Cornwall displays several of the,characteristic techniques,of draughtsman, Robert Dawson (1771-1860).,He used dense colour washes and short, hatched lines pointing in the direction of slopes ('hachures') to,represent relief,,combining them,with numerical estimates of relative altitude.,Magnetic north is decoratively indicated just off the coast at Tintagell Castle, the legendary birthplace of King Arthur, to the central left of the picture.,Launceston Castle is,shown at the most easterly point of the smaller inland landmass.,Slate quarries are marked at Delaboule, in the centre of the left landmass, and Tresmarrow, in the centre of the right.,Pencil lines are clearly visible, recording the,angles between fixed points used for triangulation.,The paper carries an Edmeads,,amp; Pine watermark. Dawson, Robert