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Adjusting cable tension - how ?

Sydney's Anzac Bridge -- many pix - e.g., http://sydneynearlydailyphot.blogspot.com.au/2011/02/anzac-bridge-from-r... is far simpler - though there are interesting views where the lines from the two towers can be seen crossed. This may be more of an engineering question -- but I wonder just how the load in the cables is adjusted so the bridge is properly supported? And with increasing traffic load - why is the tension still properly shared ?
An issue for the Jerusalem Chord bridge too - though with much lighter traffic loads -- but very concentrated point load as a light rail crosses.

Harvey

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