The Society for the Diffusion of Useful Knowledge was founded in 1826 with the high-minded aim of making 'useful' information available to self-taught members of the working and lower middle classes. Some of the material was decidedly abstruse, subscribers fell away and the Society was wound up in 1848; however, the series of 209 maps published over a 14 year period from 1829 onwards were highly praised for their superior quality, accuracy and aesthetic appeal and remain an outstanding achievement. Calcutta expanded rapidly under the Governor-Generalship of Wellesley at the beginning of the nineteenth-century. By the time our map was engraved Calcutta was considered the second city of the Empire, boasting the public architecture which led to the further epithet:, City of Palaces