rotary calculator

rotary calculator

[′rōd·ə·rē ′kal·kyə‚lād·ər]
(computer science)
A type of mechanical desk calculator that is distinguished from key-driven calculators by virtue of a latching selection keyboard in which the multiplicand or divisor could be indexed and then repeatedly transferred to the accumulator, positively or negatively by turning a crank; the accumulator and a cycle-counting register were mounted in a carriage that could be shifted right or left, relative to the selection keyboard, to accommodate the successive digits of the multiplier or quotient.
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I started out adding up spreadsheets with a rotary calculator in business school.