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  2. Adding machine - Wikipedia

    en.wikipedia.org/wiki/Adding_machine

    To add a new list of numbers and arrive at a total, the user was first required to "ZERO" the machine. Then, to add sets of numbers, the user was required to press numbered keys on a keyboard, which would remain depressed (rather than immediately rebound like the keys of a computer keyboard or typewriter or the buttons of a typical modern machine).

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  4. Slide calculator - Wikipedia

    en.wikipedia.org/wiki/Slide_calculator

    The Addiator is composed of sheet-metal sliders inside a metal envelope, manipulated by a stylus, with an innovative carry mechanism, doing subtract ten, carry one with a simple stylus movement. Some types of Addiators can also handle negative numbers (with a complementary bottom window or by providing a subtraction mode on the back side of the ...

  5. Pascaline - Wikipedia

    en.wikipedia.org/wiki/Pascaline

    The Pascaline is a direct adding machine (it has no crank) so the value of a number is added to the accumulator as it is being dialed in. By moving a display bar, the operator can see either the number stored in the accumulator or the 9's complement of its value. Subtraction is performed like addition by using 9's complement arithmetic.

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  7. Mechanical calculator - Wikipedia

    en.wikipedia.org/wiki/Mechanical_calculator

    The machine could add and subtract six-digit numbers, and indicated an overflow of this capacity by ringing a bell. The adding machine in the base was primarily provided to assist in the difficult task of adding or multiplying two multi-digit numbers. To this end an ingenious arrangement of rotatable Napier's bones were mounted on it.

  8. Addition - Wikipedia

    en.wikipedia.org/wiki/Addition

    Download as PDF; Printable version; In other projects ... Even for the simple case of adding natural numbers, ... [44] it was the first operational adding machine. It ...

  9. Arithmometer - Wikipedia

    en.wikipedia.org/wiki/Arithmometer

    The first prototype (the 1822 machine) had a capacity of 6 digits even though the machine described in the 1820 patent [1] is an 8 digits machine. The piano arithmometer with a capacity of 30 digits, allowing for numbers up to 1 nonillion (minus 1) , which was built for the 1855 Exposition universelle de Paris and which is now part of the IBM ...