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  2. Pinwheel calculator - Wikipedia

    en.wikipedia.org/wiki/Pinwheel_calculator

    Turn the wheels one way and one performs an addition, the other way a subtraction. As part of a redesign of the arithmometer , [ 1 ] they reduced by an order of magnitude the cost and the size of mechanical calculators on which one could easily do the four basic operations (add, subtract, multiply and divide).

  3. Slide rule - Wikipedia

    en.wikipedia.org/wiki/Slide_rule

    Proportion wheels are still used in graphic design. Various slide rule simulator apps are available for Android and iOS-based smart phones and tablets. Specialized slide rules such as the E6B used in aviation, and gunnery slide rules used in laying artillery are still used though no longer on a routine basis.

  4. Sieve of Pritchard - Wikipedia

    en.wikipedia.org/wiki/Sieve_of_Pritchard

    Now form wheel 3 with length 5 × 6 = 30 by first extending wheel 2 up to 30 and then deleting 5 times each number in wheel 2 (in reverse order!), to get 1 2 3 5 7 11 13 17 19 23 25 29. The first number after 1 for wheel 3 is 7; note it as a prime. Now wheel 4 has length 7 × 30 = 210, so we only extend wheel 3 up to our limit 150. (No further ...

  5. 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.

  6. 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.

  7. Executive Orders Signed By Donald Trump - The Huffington Post

    data.huffingtonpost.com/2017/trump-executive-orders

    Directs a review of NAFTA and other free trade agreements. Read Order Read article ; April 29, 2017 Establishment of Office of Trade and Manufacturing Policy. Creates a trade policy office within the White House. Read Order Read article ; April 29, 2017 Implementing an America-First Offshore Energy Strategy

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