Arithmograph
In the 19th century, calculating machines were called arithmographs , which today would probably be called arithmometers . For example, Léon Bollée built such an arithmograph in 1887 .
Even number crunchers were invented in 1889 by Frenchman L. Troncet and under the name Arithmographe sold.
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Individual evidence
Comparisons
- Arithmogriph - symbol puzzle