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The 70-ton axle of the Ferris wheel after its arrival in Chicago in 1893.
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Axle of the Ferris Wheel

Credit: The Dream City: a portfolio of photographic views of the World's Columbian Exposition/ with an introduction by Professor Halsey C. Ives, Published weekly by St. Louis, MO.: N. D. Thompson Co., 1893-1894.

To insure the safety of his "gargantuan Ezekiel's Wheel," William Ferris required the Bethlehem Steel Company to make the 45-foot, 70-ton axle six times more stout than was needed to be safe. Ferris' axle, the weight of a large locomotive, was at that time the heaviest piece of steel ever forged.

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