GAY-LUSSAC, L'Alcoomètre Centésimal, 1824

First edition.
In 1821, he was commissioned by the French administration to define a practical method for accurately measuring the alcohol concentration of drinks. Gay-Lussac is developing a hydrometer graduated on the volumetric alcohol concentration. This gives the Gay-Lussac degree which corresponds to the percentage of alcohol in the wine for example. The law of 1824 on the taxation of alcoholic beverages uses his work. With Collardeau, a former student of the École Polytechnique, he became a manufacturer of scientific instruments and marketed his alcoholometer in 1830.