Draughtsman: Dawson, Robert
Medium: Pen and ink on paper
Lieutenant Alexander W Robe's pencil inscription at the bottom of this drawing reads: "Some mistake must have been made in the construction of this piece of work that it will be considered necessary to lay it down afresh as I find it will not fit the trig and coincide with the edges of the plans to the West, Nos. 309 and 323." An area calculation table survives in black ink in the top-left margin with the area totalling 18.86 square miles. Colour washes depicting relief are combined with numerical annotations in red where spot heights have been measured. Archaeological details are noted in gothic lettering.