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reverse curve

an S -shaped curve, as on highways and railroad tracks, produced by the joining of two curves that turn in opposite directions. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Historical Examples
  • The tunnel itself includes a reverse curve, and, at the present time, railroad tracks and Stock Creek waters run through it.

  • At 100 feet a reverse curve brought the cavern on a course parallel to that which it had held up to 60 feet.

  • It is here shown combined with the second volute in the form of a reverse curve.

    Industrial Arts Design William H. Varnum

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