A Travelling County Atlas
Having earlier appeared in the Topographical Dictionary and A New British Atlas (published 1833 to 1836), it is now published in A Travelling County Atlas (published 1842 many times to 1888) - and will be in A New County Atlas (1847).
Displayed scale of 10 miles = 37mm, or 6.9 miles/inch; actual scale = 6.6 miles/inch, or 1:420,000.
Since 1833 some railways have been added - in blue from London to Brentwood and in black beyond that past Colchester into Suffolk, and also in blue from Stratford to Bishops Stortford and in black beyond that northwards into Cambridgeshire. The growing lines reached Brentwood in 1840 and Bishops Stortford in 1842, and would extend further in the next few years; the Acts authorizing their building were passed in 1836 and 1835 respectively.