Pages from a 'Gyropilot Operating Bulletin,' part of the personal papers of Lt. Bancroft from his Korean War-era flying service. Nicknamed 'Elmer,' this early automatic pilot system relieved aviators of constant manual control during long flights. These illustrated instructions detail how to execute and recover from a 'caged turn,' reflecting the technical training pilots received on emerging automated flight-control technology in the postwar era. Project: 218077