Objekt

https://edan.si.edu/slideshow/viewer/?eadrefid=NASM.XXXX.0394_ref521

presented by O. Chanute:

Über Flügelkonstruktionen in Untersuchung an Vögeln (S.9): "Le Bris: [...] Why did he use 'Canton flannel, with the hairy side downwards' for his aeroplanes? I may remark in conclusion, that most of the accidents with flying machines or models, have arisen from a disturbed balance of equilibrium.It will not be a safe or an istant remedy, to shift the weight fore and aft during flight. The prompt regulation for level must be performed by a horizontal rudder, or tail, which will raise o lower the stern as required."