SKETCHES BY WILBUR WRIGHT FOR TISSANDIER.
Two sheets of graph paper, 18 x 12 inches and 7 x 4 inches, with extensive pencil sketches recto and verso, and annotations in ink by Paul Tissandier. Some chipping and short tears at edges, lightly toned.
"SKETCH DONE BY WILBUR WRIGHT AT MY HOME IN PARIS. JUNE 1911, PAUL TISSANDIER."
An intriguing group of diagrams apparently used in the instruction of the Wright brothers' pupil Tissandier. Consisting of around seven diagrams, mostly captioned in Tissandier's hand in French. On the larger sheet, all apparently in Wilbur's hand ("fait par Wilbur Wright"): cross-section showing a stick figure with a rudimentary wing (probably an allusion to one of the Kitty Hawk gliders); "Map of the area where Kitty Hawk was, where he had his first experiences"; map of the airstrip at Dayton, so captioned; indistinct sketches showing a wing in profile; loosely-delineated "graph of the lift-generating force of surfaces at different incidences."
On the smaller sheet: another plan of the Dayton aerodrome, by Orville and so captioned; "Sketch of the tests that Wilbur and Orville made to find out the best form for the uprights of the machine, sketch made at my home by Orville Wright in December 1910, Paul Tissandier."
Orville left the US for Europe in November 1910, and found both the German and French Wright companies struggling financially. Wilbur followed in March of the following year, to testify in a French patent suit in Paris and to train pilots in Germany.