| 1. | Odhner developed the first version of his mechanical calculator in 1873.
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| 2. | In the era of mechanical calculators this simplicity was critical.
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| 3. | Wilhelm Schickard designed and constructed the first working mechanical calculator in 1623.
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| 4. | The mechanical calculator was also developed as a tool for hand computation.
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| 5. | This created the link between the mechanical calculator industries and the electronic.
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| 6. | Electric motors were used on some mechanical calculators from 1901.
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| 7. | He advocated mechanical calculators and had one in his office.
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| 8. | Tank testing of hull models was introduced and mechanical calculators as range finders.
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| 9. | Until the mid 1900s consisted of analogue mechanical calculators.
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| 10. | Late in the 1900s Webner was employed by the American Mechanical Calculator Company.
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