1490. GUSTAVE EIFFEL (1832 - 1923) French civil engineer whose construction of the Eiffel Tower proved his theories of the strength of metal framework in building construction. A.L.S. 1p. sm. 8vo., Paris, Jan. 1, 1913, in French to "M. Leante, member of the Institute", in part: "...I have been told that...you have sent my note to the Academy...I send you...all my most sincere thanks, also my excuses for any disturbance that I may have caused you during your visit to my laboratory...". Folds, else very good condition. $300 - 400