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Photo fantasy


The story concerning the corrosion of the Severn Bridge suspension cables (NCE 13 July) is serious enough.

But to show a photograph of the North Side cable with its protective wrapping wire partly removed can only add to that concern. It appears to give the misleading impression that the individual wires are indeed showing worrying signs of corrosion.

The photograph in fact appears to show the remains of the red lead paste that would have been applied to the galvanized main cable wires before the outer protective wrapping was undertaken, at the time of construction, as noted in the article.

This photograph does not show wire corrosion. In fact where the bare main cable wires can be seen, it seems to show that the zinc coating is still present.

If the Severn Bridge cables are really worse than those at the Forth Bridge, this photograph does not provide the evidence to justify this belief.

Tony Oakhill (M), Associate, Gifford, Carlton House, Ringwood Road, Woodlands, Southampton, SO40 7HT

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