"The thing just came to me all of a sudden one day when I was watching one of those mechanical pianos pounding out that ghostly sort of music where the piano keys press up and down, and the music blares out, but no human hand touches the keys. Through the glass front, I was watching the paper roll in the piano, how it passed in front of a place where air was applied. The air was blown through the little holes in the paper, thus striking the keys and playing the piano. Right then the idea got me that when the airplane gets off the horizontal or longitudinal axis, a stream of air blowing through small holes in a gyroscopic instrument could strike the controls with the strength of a powerful hand, thus bringing the plane back to its normal position--"