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Samuel Morland,  Henri Sutton e Samuel Knibb, Macchina calcolatrice
Samuel Morland, Henri Sutton and Samuel Knibb, Calculating machine

London 1664
Silver, gilt and silvered brass, wood, crystal; 18x55,5 cm
Florence, Istituto e Museo di Storia della Scienza, inv. 679

This is one of the oldest still-functioning devices for performing calculations with mechanical systems. It may be regarded as a precursor to modern calculators.