Maps of Wales
Scale: 1 : 31680
Description: .This drawing is formally titled and includes an area-calculation table. Trigonometrical stations are indicated by dots with radiating pencil lines marking the angular measurements taken from these points. Trigonometrically surveyed heights are marked in red ink at the summits of hills. Primary triangulation stations are labelled ABC and circled by a pecked line.
Contibutor: Dawson, Robert
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