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  2. Pinwheel calculator - Wikipedia

    en.wikipedia.org/wiki/Pinwheel_calculator

    A pinwheel calculator is a class of mechanical calculator described as early as 1685, and popular in the 19th and 20th century, calculating via wheels whose number of teeth were adjustable. These wheels, also called pinwheels, could be set by using a side lever which could expose anywhere from 0 to 9 teeth, and therefore when coupled to a ...

  3. Odhner Arithmometer - Wikipedia

    en.wikipedia.org/wiki/Odhner_Arithmometer

    Odhner thought of his machine in 1871 while repairing a Thomas' Arithmometer (which was the only mechanical calculator in production at the time) and decided to replace its heavy, bulky Leibniz cylinder by a lighter, smaller pinwheel disk. This is why the two machines share the same name but look completely different.

  4. Stepped reckoner - Wikipedia

    en.wikipedia.org/wiki/Stepped_reckoner

    Despite the mechanical flaws of the stepped reckoner, it suggested possibilities to future calculator builders. The operating mechanism, invented by Leibniz, called the stepped cylinder or Leibniz wheel, was used in many calculating machines for 200 years, and into the 1970s with the Curta hand calculator.

  5. Calculator added up to fun for a math phobic kid in the 1970s ...

    www.aol.com/calculator-added-fun-math-phobic...

    The gift of a Texas Instruments calculator opened a new world of math problems and secret codes in the years before smartphones. Calculator added up to fun for a math phobic kid in the 1970s ...

  6. Mechanical calculator - Wikipedia

    en.wikipedia.org/wiki/Mechanical_calculator

    The Facit calculator, and one similar to it, are basically pinwheel machines, but the array of pinwheels moves sidewise, instead of the carriage. The pinwheels are biquinary; digits 1 through 4 cause the corresponding number of sliding pins to extend from the surface; digits 5 through 9 also extend a five-tooth sector as well as the same pins ...

  7. Mortgage rate history: 1970s to 2025 - AOL

    www.aol.com/finance/mortgage-rate-history-1970s...

    Mortgage rate history: 1970s to 2025. Andrew Dehan. ... 1970s mortgage rate trends. The average 30-year fixed-rate mortgage started the decade at about 7.5 percent in 1971 (the earliest year for ...

  8. Leibniz wheel - Wikipedia

    en.wikipedia.org/wiki/Leibniz_wheel

    In the position shown, the counting wheel meshes with three of the nine teeth of the Leibniz wheel. A Leibniz wheel or stepped drum is a cylinder with a set of teeth of incremental lengths which, when coupled to a counting wheel, can be used in the calculating engine of a class of mechanical calculators.

  9. 11 charts that show how American houses have changed since ...

    www.aol.com/article/finance/2016/06/05/11-charts...

    Houses have been getting bigger and fancier for the last several decades, and we have the charts to prove it. Every year, the Census Bureau releases data on the characteristics of newly ...