Mercantile map of the World on Mercator's projection 1868

Map of the world showing principal railway routes, steam routes, telegraph cables and ocean currents. British Empire coloured in red. Insets: Bermuda; Trinidad; Aden; Jamaica; Malta Harbour; Gibraltar; Heligoland; Seychelle and Amirante Islands; Mauritius; Malacca and Nanning; Singapore; Penang; Perim; Labuan; Hong Kong. Tables:largest empires; principal ocean steam routes; British imperial possessions. Chart has dark green cardboard covers attached