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Verulam

The Millennium Bridge Verulam quoted some of Francis Walley's reminiscences of some earlier bridge tests (3 October 2OOO) but clearly did not get things quite right. Dr Walley, writing from Coulsdon, Surrey, has sent the more accurate version: In view of the interest of in-step and out-of-step may I go back over 40 years when the suspension bridge in St James' Park was replaced. With the slenderness achieved in the present one it was clear that frequency was to be the dominant criterion; it was also considered undesirable that a pedestrian at rest should be perturbed by the passage of other pedestrians, and the design of the structure took both these factors into account.