![]() Over time, during the 1950s and 1960s a variety of different brands of mechanical calculators appeared on the market. This was a small, portable, mechanical calculator that was about the size of a pepper grinder. During the Manhattan project, future Nobel laureate Richard Feynman was the supervisor of human computers who understood the use of differential equations which were being solved for the war effort. ![]() By the 1920s Lewis Fry Richardson's interest in weather prediction led him to propose human computers and numerical analysis to model the weather to this day, the most powerful computers on Earth are needed to adequately model its weather using the Navier–Stokes equations.Ĭompanies like Friden, Marchant Calculator and Monroe made desktop mechanical calculators from the 1930s that could add, subtract, multiply and divide. The word «computer» was a job title assigned to people who used these calculators to perform mathematical calculations. ![]() The Curta calculator can also do multiplication and division.īy the 20th century, earlier mechanical calculators, cash registers, accounting machines, and so on were redesigned to use electric motors, with gear position as the representation for the state of a variable.
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