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On This Day

  • 8-1-1767

    Charles Mason and Jeremiah Dixon finished drawing what some describe as "the world's longest straight line." Actually two straight lines, it forms parts of the boundaries between the U.S. states of Maryland, Pennsylvania, and Delaware.

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    Mason-Dixon Line
  • 8-1-1881

    Otto Toeplitz born in Breslau, Germany (now Poland). In 1949 he published an introduction to the calculus on a historical basis. This delightful book is available in English as The Calculus: A Genetic Approach.

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    Otto Toeplitz
  • 8-1-1944

    Start of MARK series of computers: The MARK I computer began operation at Harvard University. The IBM Automatic Sequence Controlled Calculator was an electro-mechanical computer.

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    Harvard Mark I