Document
Birkenhead
.The formal title at the top left of this drawing states that Robert Dawson supervised the surveyor. One of the best surveyors and draughtsmen, Dawson was employed on the Ordnance Survey for over forty years, also working as an instructor. The scale of the drawing is noted and the area of the land is recorded as 64.0185 square miles. A triangulation diagram appears on the reverse of this drawing. This was an essential tool enabling draughtsmen to plot the exact location of topographical features. Hill sketching has not been included on this plan.
The British Library1836
1836