[Maurice BELLONTE]. Set relating to the feat of the first East-West transatlantic flight, achieved by Costes and Bellonte on September 2 and 3, 1930. Interesting set on the transatlantic flight of Costes and Bellonte. Period photo of the Question Mark in flight, taken in July 1930 after a day of testing, annotated by Bellonte: "This same photo illustrated the book of R. Weiss and more detailed in the clouds sky less black. Page 35"; and on the back "Photo belonging to M. Bellonte to be returned to him personally" (13.5 x 20 cm); plus another period photo, in negative, of the forecast of the route, made on August 31 and valid until September 2 at 9pm. (20 x 25 cm). Folder containing about twenty sheets of autograph notes on the tests of engines and planes carried out in 1929 and 1930. "Preparation of the Atlantic. The engine delivered and installed [...]. Tests to be made with mixture 0,775 [...]". "Costes aircraft (geared engine) 24/5/29 climb to 5000m [...]. Direct engine 10/6 rise to 5000 Propeller 71 N°14. 11/6 rise to 5000 Propeller 77 N°18 "...; tables and notes of calculation, list of the spare tools on board; " March 12 Le Bourget ADDT Goliath Dry breakdown about 50 seconds after departure, seizure and rupture of the distribution "...; reports of tests and breakdowns, etc., as well as a series of 10 oblong in-fol. typewritten tables reporting the tests carried out on the Costes 61 engine on June 21 and 22, 1930. Invitation from the University Club of New York (Sept. 9, 1930), membership card of the Aero Club of Oregon (signed M. F. Wright, Sept. 26, 1930), card of the American Legion (Oct. 1, 1930). Brochure: Senate Reception of Airmen Costes & Bellonte, Nov. 5, 1930; plus mimeographed typescript, with corrections, of the Speech of Mr. Gaston Ménier, Chairman of the Senate Aviation Group. Letter from the Lille radio station to Mrs. Costes about the remote interview experiment carried out on this occasion (Sept. 6, 1930); plus press clippings and leaflet from the Société Française Radio-Électrique: Le raid Paris-New York de Costes et Bellonte et la T.S.F. " Fragment of a typescript with annotations from Bellonte: "But on August 31 the weather situation on the ocean was clearly favorable"... Documents detailing the list of recipients of the book on the Atlantic crossing. Letter from the American Embassy (Commander Walsh) sending him a map "that you wanted to use for your transatlantic voyage" (attached map of New York and its surroundings, annotated in red pencil and graphite) 3 letters of congratulations (including one from the National Aeronotic Association of U.S.A. of Sept. 3, 1930), and another addressed to Dieudonné Costes (Montreal Sept. 6) Invitation card from Louis Bréguet (not named) for the ceremony of honors on the return of Costes and Bellonte to the Bréguet factories in Villacoublay (Oct. 28, 1930). - Typed draft contract with handwritten corrections, between Costes and Bellonte, for the formation of a civil company "having for object the exploitation of an air trip over the Atlantic Ocean, North line, from East to West, Paris to New York". An important set of press clippings mostly dedicated to the transatlantic crossing of 1930.