01760oam 2200529I 450 991071335800332120200401081302.0(CKB)5470000002500063(OCoLC)1111633658(EXLCZ)99547000000250006320190806d1923 ua 0engurbn|||||||||txtrdacontentcrdamediacrrdacarrierAn optical altitude indicator for night landing /by John A.C. Warner[Washington, D.C.] :National Advisory Committee for Aeronautics,1923.1 online resource (5 pages, 3 unnumbered pages) illustrationsTechnical notes / National Advisory Committee for Aeronautics ;No. 123"January, 1923."No Federal Depository Library Program (FDLP) item number.Includes bibliographical reference (page 4).Landing aids (Aeronautics)AirplanesLightingNight flyingAirplanesLightingfastLanding aids (Aeronautics)fastNight flyingfastLanding aids (Aeronautics)AirplanesLighting.Night flying.AirplanesLighting.Landing aids (Aeronautics)Night flying.Warner John A. C.1415227United States.National Advisory Committee for Aeronautics,TRAALTRAALTRAALOCLCFOCLCOGPOBOOK9910713358003321An optical altitude indicator for night landing3516624UNINA