Here Augustin-Louis stayed for three years, and although he had an extremely busy managerial job, he still found time to prepare three mathematical manuscripts, which he submitted to the "Première Classe" (First Class) of the Institut de France.
=== Inženirska leta ===Po diplomi leta 1810 je sprejel službo kot mladi inženir v Cherbourgu, kjer je Napoleon želel zgraditi pomorsko oporišče.