Index to the map of London made for the Metropolitan Commissioners of Sewers
Publisher: Metropolitan Commission of Sewers
Medium: Lithograph, coloured
This map's title and imprint feature at top left, with an explanatory note at bottom right and scale bar at bottom centre. The map is divided into rectangles, forming the index to two "London and its Environs" Ordnance Survey maps. The cholera outbreaks of the 1830s and 40s forced the government to improve London drainage and sewage disposal. The Commission of Sewers was established to combine seven of the eight existing sewage companies into one, unifying their drainage systems.