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Skeleton testing frame in a tunnel on the Northern line


Skeleton testing frame in a tunnel on the Northern line


The frame was used to check clearances in the tunnel during its enlargement, in what was then the City and South London Railway and is now part of the Northern line of the London Underground



OC 4532 Temple-Richards, H.B.: A method for testing tube tunnels for clearance while tunnels are in the course of construction, 1924
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