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  2. Pinwheel calculator - Wikipedia

    en.wikipedia.org/wiki/Pinwheel_calculator

    The teeth are moved by a second wheel located inside the first and moved by a side lever. 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.

  3. Pascal's calculator - Wikipedia

    en.wikipedia.org/wiki/Pascal's_calculator

    Schickard's machine used clock wheels which were made stronger and were therefore heavier, to prevent them from being damaged by the force of an operator input. Each digit used a display wheel, an input wheel and an intermediate wheel. During a carry transfer all these wheels meshed with the wheels of the digit receiving the carry.

  4. History of mathematical notation - Wikipedia

    en.wikipedia.org/wiki/History_of_mathematical...

    In 1917 Arnold Sommerfeld created the contour integral sign, and Dimitry Mirimanoff proposed theaxiom of regularity. In 1919, Theodor Kaluza would solve general relativity equations using five dimensions, the results would have electromagnetic equations emerge. [85] This would be published in 1921 in "Zum Unitätsproblem der Physik". [86]

  5. Militor truck - Wikipedia

    en.wikipedia.org/wiki/Militor_truck

    Ordnance Department testing at Hook Mountain, Nyack, New York, August 1918. In November 1917, the Ordnance Department placed an order with the Militor Corporation to design, develop, and build a four-wheel drive vehicle for potential adoption as a standard truck for the Army.

  6. Wheel theory - Wikipedia

    en.wikipedia.org/wiki/Wheel_theory

    A diagram of a wheel, as the real projective line with a point at nullity (denoted by ⊥). A wheel is a type of algebra (in the sense of universal algebra) where division is always defined. In particular, division by zero is meaningful. The real numbers can be extended to a wheel, as can any commutative ring.

  7. The Millionaire (calculator) - Wikipedia

    en.wikipedia.org/wiki/The_Millionaire_(calculator)

    The manufacturing cost of Bollée's machine was too high and the production was discontinued after a few units. The Millionaire was built with the same target of direct mechanical multiplication in mind. [14] In first decades of 20th century two other machines with direct multiplication were produced: the Moon-Hopkins [15] and Kuhrt-US. [16]

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  9. Arithmometer - Wikipedia

    en.wikipedia.org/wiki/Arithmometer

    The arithmometer (French: arithmomètre) was the first digital mechanical calculator strong enough and reliable enough to be used daily in an office environment. This calculator could add and subtract two numbers directly and could perform long multiplications and divisions effectively by using a movable accumulator for the result.

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