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A stainless steel conical spire

The spire is 3m in diameter at its base; it tapers to 150mm in diameter at the tip, which is 120m above ground level. It is fabricated from Grade 316L rolled stainless steel plate with a shot-peened finish. The plate is 20mm thick, except for the lowest 4m of the spire, where it is 35mm thick, and the topmost section, which is 10mm thick.

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