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were the 670-yard-long elliptical high-sloped sand wall and the wide concrete-lined trench (flame pit) with a large symmetrical water-cooled flame deflector of molybdenum-steel pipes. The concrete trench, nearly 25 ft wide with 3 ft concrete walls, sloped gradually away from each side of the flame deflector to a depth of 20 ft, rising again symmetrically toward the side of the arena. Beside the flame pit was a long underground room where 4 ft diameter delivery pipes were housed to route cooling water at 120

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