Calculator
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A calculator is typically a portable electronic device used to perform calculations, ranging from basic arithmetic to complex mathematics.
An electronic pocket calculator with a seven-segment liquid-crystal display (LCD) that can perform arithmetic operations
A modern scientific calculator with a dot-matrix display
Scientific calculator displays of fractions and decimal equivalents
The interior of a Casio FX-991s calculator
Mechanical calculator
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A mechanical calculator, or calculating machine, is a mechanical device used to perform the basic operations of arithmetic automatically, or a simulation like an analog computer or a slide rule. Most
Four of Pascal's calculators and one machine built by Lépine in 1725, Musée des Arts et Métiers
Replica of Schickard´s calculator
Detail of a replica of an 18th-century calculating machine, designed and built by German Johann-Helfrich Müller.
A mechanical calculator from Anton Braun, dated 1727