Henri GENAILLE (1856-1903) & Édouard LUCAS (1842-1891) - Lot 121

Lot 121
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Estimation :
200 - 500 EUR
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Henri GENAILLE (1856-1903) & Édouard LUCAS (1842-1891) - Lot 121
Henri GENAILLE (1856-1903) & Édouard LUCAS (1842-1891) GENAILLE calculating stick box Calculation system based on Neper's sticks or Neperian rulers, designed "to simplify the study and practice of arithmetic operations". Neper's stick system had many variants, including one developed by Henri Genaille (engineer with the Tours State Railways) and perfected by Édouard Lucas (professor of special mathematics at the Lycée Saint Louis, who studied the Fibonacci sequence). Box with 11 sticks France, second half of the 19th century 12 x 12 cm
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