Manuscripts/Mixed Material Article by Alexander Graham Bell, June 5, 1892
The first effect of the reversal of the jet would be to cause the machine to move in a circular path, the center of rotation no longer being the axis, but some point outside located either at the extremity of the wing where the jet is reversed or at some point outside the machine altogether. The machine, instead of simply rotating upon its axis, would sweep round in a circle of increasing diameter until the reversed jet has overcome the inertia of the wing to which it is attached, and has commenced to propel it in the same direction as the other wing. The machine should then move in a straight line in a horizontal direction after the manner of the proposed flying machines of Prof. Langley and Mr. Maxim. It would then move on its path without rotation.
On arrival over the place of destination the jet would agin be reversed and the machine would move in a circle of decreasing diameter until at last it would remain stationary, but in rotation like a top.
The rotation, however, need not be rapid enough to create dizziness to the occupants of the car, for it is obvious that with wings extending sufficiently from the center to support the apparatus a high velocity might be consistent with slow rotation.
For example, if each wing extended 20 feet from the axis of the machine the circular path traced by the extremity of each wing would exceed 120 feet, so that a velocity of 60 feet per second would occasion only one rotation in two seconds. The velocity of rotation being diminished the machine gradually descends towards the earth; a rope will then be let down containing at its extremity a heavy weight. When this touches the earth, the machine, relieved of the weight, no longer descends, but remains stationary. Assistants below seize hold of the rope and moor