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

Photograph

Image ID :
2578502
Image type :
Photograph
Published :
1923
Author :
Unknown
Source :
OC 4532 Temple-Richards, H.B.: A method for testing tube tunnels for clearance while tunnels are in the course of construction, 1924
Credit :
Institution of Civil Engineers
Image added on 24 OCTOBER 2013
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