EIFFEL, Installation d'un laboratoire d'Aérodynamique, 1910

First edition.
Off-print from mémoires de la société des ingéneurs civil de France.
After experimental aerodynamic tests obtained by free fall from the second floor of the tower he had built on the Champ de Mars in Paris, Gustave Eiffel had a wind tunnel built there in 1909. It was made up of a vein of tests of 3 meters in diameter over a length of 2.5 meters. The flow, generated by a propeller driven by a 70hp engine, could vary between 5 and 20 meters per second. The installation was enclosed in a 240 square meter hangar so as not to be influenced by the outside wind. This installation was used, in particular, for testing the Eiffel wing profiles which would equip a large number of French aircraft from the First World War. It was moved to Auteuil in 1912 and is still in operation today, operated by the Aérodynamic Eiffel company.

Presentation copy signed by Eiffel on cover.