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Rhymney riddle

Regarding David Teal's letter (Letters last week), when concrete is poured, it is in a liquid state.

It therefore exerts a "hydrostatic" pressure against its formwork in a manner akin to water in a swimming pool exerting a hydrostatic pressure on the walls of the pool.

The concrete in its liquid form hence exerts a horizontal force on its formwork which has been justly resisted by the Rhymney bridge's temporary works.

John Collins (Graduate), Leeds,

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