Monsieur C.-F. Martin was a retired naval clerk, and evidently he had developed a great love for painstaking calculation. Just see this 100×100 multiplication table and units conversion tables he published at the beginning of the 19th century, to help his countrymen deal with the switch from the old Empire weights and measures to the newfangled metric system introduced after the French revolution. This interesting document is described in full in my latest History-of-Computing article.
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