In May 1824, Fresnel was promoted to Secretary of the , becoming the first member of that body to draw a salary,Levitt, 2013, p.82. albeit in the concurrent role of Engineer-in-Chief.Elton, 2009, p.190. Late that year, being increasingly ill, he curtailed his fundamental research and resigned his seasonal job as an examiner at the , in order to save his remaining time and energy for his lighthouse work.Young, 1855, p.399; Boutry, 1948, pp. 601–602.
in may 1824 fresnel was promoted to secretary of the  becoming the first member of that body to draw a salarylevitt 2013 p82 albeit in the concurrent role of engineer-in-chiefelton 2009 p190 late that year being increasingly ill he curtailed his fundamental research and resigned his seasonal job as an examiner at the  in order to save his remaining time and energy for his lighthouse workyoung 1855 p399; boutry 1948 pp 601–602