Medium: Pen and ink on paper
This drawing delineates the county borders of Dorset and Somerset with a red pecked line. Pillesdon Pen, a hillfort, is indicated by concentric rings to the left of the plan, although it did not become obligatory to record archaeological sites until 1816. The fort's position, 909 ft above sea level, is depicted by dark shading and brushwork interlining ('hachuring'). The summits of hills in this undulating countryside are left bare.