A rather fine, geographical based tube 'map' of Central London and one that appears as a fold out to a small brochure issued to mark the opening of the new Underground extensions from Finsbury Park station (the old terminus of the GNP&BR) out as far as Arnos Grove station. This station opened on 19 September 1932 as the intermediate terminus of the line prior to the final extension north towards Cockfosters in 1933. This important work, along with the western extensions out towards Hounslow and Uxbridge, wa sthe final flourish of the Underground Group prior to the 1933 formation of the new London Passenger Transport Board (London Transport) and was the culmination of several important improvements to the tube network during the late 1920s and early '30s that was effectively backed by Government loans that allowed the privately owned 'Combine' to improve existing lines and expand outwards into new suburbs.
The map is interesting - the year before the Beck diagram of 1933 - and is by the designer and company employee F H Stingemore who undertook much of the mapping work at this date and carried on, post-Beck, with many of the geographical maps found in things like Country Walks books.
The nomenclature of the 'lines' is interesting as some have migrated to 'line' from 'railway' and the messy compromise of what was to become the Northern line, in 1938, has yet to be fixed. The Victoria and Jubilee lines, and the changes to the Bakerloo of 1939, have yet to appear and there are various stations that have vanished - interestingly Down St has already gone but Brompton Rd is still here. Various changes of names have occurred - and on the Piccadilly & Central lines the new interchange station at Holborn is on the verge of opening and so this is one of the last appearances of British Museum station.
The 'jazzy border' is similar to several Underground maps of the period and may have originated on some of the MacDonald Gill maps in the 1920s?