Weekend Herald

Harmonic generator


John Roughan stated (Weekend Herald, June 5), “the cost benefits were so bad, the consultant­s presumed that it was out of the question”.

Any engineer can categorica­lly state that if cyclists and pedestrian­s are allowed to cross the Auckland Harbour bridge on a regular basis, their activity will create a harmonic within the bridge structure and that harmonic will cause the bridge to collapse. London Council did almost that by building a pedestrian bridge across the Thames for their Millennium project. This was open for just one and a half days before a harmonic caused closure of the bridge pending rebuild.

Joe Little, St Heliers.

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