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  2. Curta - Wikipedia

    en.wikipedia.org/wiki/Curta

    A partially disassembled Curta calculator, showing the digit slides and the stepped drum behind them Curta Type I calculator, top view Curta Type I calculator, bottom view. The Curta is a hand-held mechanical calculator designed by Curt Herzstark. [1] It is known for its extremely compact design: a small cylinder that fits in the palm of the hand.

  3. How to calculate the present and future value of annuities - AOL

    www.aol.com/finance/calculate-present-future...

    In the world of finance, an annuity is a contract between you and a life insurance company in which you give the company a lump sum or series of payments, and in return, the insurer promises to ...

  4. Stepped reckoner - Wikipedia

    en.wikipedia.org/wiki/Stepped_reckoner

    The input section is moved with the end crank until the lefthand digits of the two numbers line up. The operation crank is turned and the divisor is subtracted from the accumulator repeatedly until the left hand (most significant) digit of the result is 0.if it shows any other number, that is the remainder. [citation needed]. The number showing ...

  5. 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.

  6. Pros and cons of lump-sum investing - AOL

    www.aol.com/finance/pros-cons-lump-sum-investing...

    A lump sum could be $10,000, $50,000, $200,000 or any amount that is large given your situation. You might find yourself with a lump sum for any number of reasons. Perhaps you received an inheritance.

  7. HP 35s - Wikipedia

    en.wikipedia.org/wiki/HP_35s

    Internal view. The HP 35s was designed by Hewlett-Packard in conjunction with Kinpo Electronics of Taiwan, which manufactures the calculator for HP in mainland China. [1] According to HP, the calculator has been engineered for heavy-duty professional use, and has been tested under extreme environmental conditions. [1]

  8. Sumlock ANITA calculator - Wikipedia

    en.wikipedia.org/wiki/Sumlock_ANITA_calculator

    Sumlock-Anita Electronics also assembled in Britain some of the Rockwell hand-held calculators, including Rockwell models 8R, 10R, 18R, 20R, 21R, 30R, 31R. The "Panaplex" is a gas-discharge display, using 7 segments to represent each number, within a thin glass "sandwich". The numerals glow amber. This list of calculator models may not be complete.

  9. Lump sum - Wikipedia

    en.wikipedia.org/wiki/Lump_sum

    A lump sum is a single payment of money, as opposed to a series of payments made over time (such as an annuity). [1] [2] [3] [4]The United States Department of Housing and Urban Development distinguishes between "price analysis" and "cost analysis" by whether the decision maker compares lump sum amounts, or subjects contract prices to an itemized cost breakdown.