Henri GENAILLE (1856-1903) & Édouard LUCAS (1842-1891) - Lot 123

Lot 123
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Estimation :
200 - 500 EUR
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Henri GENAILLE (1856-1903) & Édouard LUCAS (1842-1891) - Lot 123
Henri GENAILLE (1856-1903) & Édouard LUCAS (1842-1891) Box of BLATER calculation sticks Multi-sector slide calculator or "instant and exact calculator to simplify multiplication and division". Developed by Henri Genaille (state railway engineer in Tours) and perfected by Édouard Lucas (professor of special mathematics at the Lycée Saint Louis, who studied the Fibonacci sequence) in Paris. Paris, Eugène Belin classical bookshop Box of 11 sticks. This type of stick was used specifically for division and multiplication. France, 1885 18 x 12 cm
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