Scale 1" : 10ch. Covers distance of over 14 miles. Includes layout of Devonport Dockyard. Bears later(?) stamp 'Mr Bampton's Office, Plymouth', and stamp 'E.C. Bisshopp, Mr Bampton's Office, 12 Alfred St., Plymouth Oct 1847'. Bears also stamp 'Jh16', a drawing code number of Thomas Hawksley's water engineering company.