French engineer best remembered for designing the tower that bears his name. ALS in French, signed “G. Eiffel,” one page, 5.5 x 8.25, April 20, 1891. Letter to a friend. In full, “I am reminding you that I asked you to let me know the cost of your studies for your Lacroix turbine project; you would oblige me by sending it to me without delay.” Eiffel was also a pioneer in the field of aviation theory and created the first aerodynamics laboratory in 1912 outside of Paris. In fine condition, with a bisecting horizontal mailing fold. R&R COA.
