| 21. | The "'Curta "'is a small mechanical calculator developed by Curt Herzstark.
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| 22. | Nine Pascal calculators have been made, including the first surviving mechanical calculator from the 17th century.
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| 23. | More recent examples include slide rules, nomograms and mechanical calculators, such as Pascal's calculator.
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| 24. | It was the only operational mechanical calculator in the 17th century and the earliest automatic, digital computers.
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| 25. | It was a binary electrically driven mechanical calculator with limited programmability, reading instructions from punched celluloid film.
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| 26. | The desk-sized calculator was finished in 1954 and was Japan's first electro-mechanical calculator.
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| 27. | There is no doubt, however, that Atanasoff's device was unlike the mechanical calculators of the era.
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| 28. | Unchastened, brains learned to amplify themselves with pencils and paper, slide rules, mechanical calculators and electronic computers.
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| 29. | A "'difference engine "'is an automatic mechanical calculator designed to tabulate tables of numbers.
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| 30. | A new technology on display were air-powered tools along with the mechanical calculator by George B . Grant.
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