Scale 1" : 1/2m.
Bears an 'Explanation', tables of distances from Boulter's Lock and from London Bridge, numerous improvements made by the City of London from Aug 1774 to Apr 1777, and references to the once proposed canal from Isleworth to Monkey Island.
'Engraved by Thomas Jeffreys, Geographer to the King 1771. Revised and continued to London Bridge in 1774 by Robt. Whitworth.'