2h 33min, mar 15, 1669 y - Binary Arithmetic
A manuscript dated March 15, 1679 by Gottfried Wilhelm LeibnizOffsite Link, preserved in the Gottfried Wilhelm Leibniz, Bibliothek Niedersächsische LandesbibliothekOffsite Link, Hannover, “includes a brief discussion of the possibility of designing a mechanical binary calculator which would use moving balls to represent binary digits.”
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