The equilibrimotor is a personal flying device - essentially a primitive version of a jet pack. It allows the user to fly without the aid of a flier.
The equilibrimotor is an ingenious device for individual flying. It consists of a broad belt, not unlike the life belt used aboard passenger ships on Earth; the belt is filled with the eighth Barsoomian ray, or ray of propulsion, to a sufficient degree to equalize the pull of gravity and thus to maintain a person in equilibrium between that force and the opposite force exerted by the eighth ray. Attached to the back of the belt is a small radium motor, the controls for which are on the front of the belt; while rigidly attached to and projecting from the upper rim of the belt is a strong, light wing with small hand levers for quickly altering its position.