Airplane pilots‘soon may be offered a new “blind flying” aid in the form of a pendulum device, which is interpreted by feeling rather than by watching, as in the case of other instruments. It consists of a relatively simple pendulum arrangement, having a handle projecting upward which the pilot holds with his left hand, while he holds the control stick with his right hand. By following the motions of the loft hand with similar motions of the right, it is possible to keep the plane balanced correctly against both gravitational and centrifugal forces, according to the inventor, Lieut. Norman Lee Barr of the United States Navy, who has authorized manufacture and use of the instrument by the government. When the nose of the airplane is falling, warning is transmitted through the handle of the device that a backward pull of the stick is impearative,