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English
Detail of the skew arch bridge at Boxmoor, showing the stepped extrados (outer curve of the arch)
1954 January, “Strengthening of Coquet Viaduct”, in Railway Magazine, page 19:
The two lower rows of tubes at each end pier were then drilled through to the extrados of the brickwork to act as weep holes and assist in the drainage from the backs of the arches.
