Blériot XI. A cropped version of the next shot. Horizon adjusted.
The aircraft is powered by a 70hp Gnome Omega rotary, an amazing early type of aero engine where the crankshaft remains fixed within the engine and the cylinders (directly connected to the propellor) whirl around the crankshaft. Because of the high centrifugal and gyroscopic forces involved, the engine's rotational mass has a dominating effect on the control of the aircraft. The castor oil lubricant also has a distinct propensity to leave the engine and deposit itself over the airframe and pilot, giving rise to the expression "Well-lubricated."