Weathering steel
Two identical conical sections inverted relative to each other One: 12 ft. (3.7 m) high x 109 ft. (33.2 m) along the chord x 2 inches (5.1 cm) thick One: 12 ft. (3.7 m) high x 107 ft. 10 inches (32.8 m) along the chord x 2 inches (5.1 cm) thick
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