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|Size||128 x 280mm|
|Location||Stored at the London Metropolitan Archives|
|Acquired||Auction at Bonhams
Grants from NHMF, Art Fund, V&A, Friends National Libraries & Trinity Buoy Wharf
Lithographic overview of the 'Great Descents' (similar to the previous but in a smaller format and omitting the tunnel cross-section), lithographed by Warrington after Pinchback; marked up by Brunel, with in the margin pencilled calculations as to the length of tunnel required for completion, and in the map itself in ink with the same calculations (marked as 727ft 9in at the position of the shield, plus notes of the position of the old shield, compass points, etc.)