An Illustrated History of the Calculator
4 hours ago
- #calculator-history
- #mechanical-calculators
- #technology-evolution
- The history of computers is often overly broad, including unrelated items like mechanical clocks and weaving looms, which dilutes the true narrative.
- The calculator's development deserves its own story, distinct from computers, beginning with ancient tools like notched sticks and the abacus for addition and subtraction.
- Multiplication tables date back thousands of years, with early examples from Babylon and China, and were used alongside devices like a mechanical monkey linkage for multiplication.
- The slide rule, invented in the 1620s, used logarithmic scales to multiply by adding distances, becoming essential for engineers until the 1970s.
- The carry mechanism, pioneered by Blaise Pascal in 1642, automated overflow handling in adding machines, leading to portable devices like the Webb adder.
- Early adding machines evolved from stylus-operated disks to keyboard-based inputs, with designs like the Comptometer using nine keys per digit, making them bulky.
- Gottfried Leibniz's stepped drum calculator separated input and output registers, enabling multiplication and division via a crank, later refined in pinwheel calculators.
- Mechanical calculators like the Curta miniaturized the design, while electromechanical versions added motors, preceding fully electronic calculators.
- Electronic calculators faced display challenges, with early models using printers, CRTs, or nixie tubes, until vacuum fluorescent displays (VFDs) enabled portability.
- LED and LCD displays further reduced power needs, leading to handheld calculators and calculator watches, though they were eventually superseded by cell phones.