(1-19) Nineteen small sheets of maps of the Isle of Wight (including areas around Brading, Godshill, Osborne). Scale: 3 inches to 1 mile. The sheets show various methods of depicting relief, mathematical calculations, doodles, notes, and evidence of the draughtsman's having wiped his pen on the paper before or after working: all point to the conclusion that these are probably Dawson's original field drawings in preparation for what became the Ordnance Survey map of the Isle of Wight. They may be the work of Thomas Yeakell: compare MPH 1/773. Dimensions of sheets: between 33.8 cm x 56 cm and 29.2 cm x 5 cm. (20) Wrapper inscribed, 'Contents of the Plan viz t Acres 12219.2', and signed by F G Mulcaster, 1 October 1791.