August 1958 Issue [Article] A gadget to cut down on mid-air collisions Download PDF Adjust Share by A.M. (Arthur Martin) Watkins, This article is only available as a PDF to subscribers. Download PDF Tags 20th century Aircraft accidents Doppler navigation Inertial navigation (Aeronautics) United States More from A.M. (Arthur Martin) Watkins St. Louis takes the cure A case history for ailing cities Shell housing A blessing with a few bugs in it A good house nowadays is hard to find Adjust Share