COLLARDEAU (ou COLLARDEAU-DUHEAUME)   1820, 1833

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Charles Felix Collardeau-Duheaume published in 1820 the first French manual of instruction on the slide rule. It is a book of 87 pages that presents the main possibilities of the rule, with explanatory diagrams and an engraving representing the various parts of the rule.

In 1833, he published another manual, 92 pages long, with several engravings of the slide rule and the positions of the rule for the various operations. This manual is more accurate than the previous one. For example, the author gives explanations on how to choose your rule correctly, as well as on how to read decimal numbers. Collardeau specialized in the manufacture of laboratory equipment and collaborated extensively with Gay-Lussac, to whom he dedicated this second book.

Collardeau was admitted to the École Polytechnique in 1815. But he is "discharged according to the order of 13 April 1816. [all students were dismissed by King Louis 18th following protests] He left school on 15 April. Allowed to enter the open competition in 1817 for admission to public services... Deemed inadmissible following the declaration of the jury of October 28, 1817."