CALCULATORS An electronic pocket calculator with a LCD seven-segment display , that can perform arithmetic operations. A modern scientific calculator with a dot matrix LCD. The first mechanical calculator was invented by Wilhelm Schickard in 1642. An electronic calculator is a small, portable electronic device used to perform both basic operations of arithmetic and complex mathematical operations. The first solid state electronic calculator was created in the 1960s, building on the extensive history of tools such as the abacus (developed around 2000 BC), and the mechanical calculator (developed in the 17th century AD). It was developed in parallel with the analog computers of the day. The pocket sized devices became available in the 1970s, especially after the first microprocessor developed by Intel for the Japanese calculator company Busicom. They later became commonly used within the Oil and Gas industry. Modern electronic calculators vary: fro...
