The constant battle to resist the corrosion of the structural steelwork of a bridge commences even before its erection, and must continue relentlessly throughout the life of the structure. This has been the case with the San Francisco‐Oakland Bay Bridge where the painted surface area of 370 acres extends from a height of 6 ft. above high water to 530 ft. above the water at the top of aircraft warning beacons on the suspension bridge towers.
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