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20/20 distant visual Aavaan Agitating Fan Aviation Medicine background luminance levels Blethrow and D. L. Civil Aeromedical Institute clear air value D. L. Lowrey densities of screening densities of smoke diffusing screen dimmer control distant visual acuity eight sizes emergency signs experimental signs Federal Aviation Administration Federal Aviation Regulation four background luminance Identified When Presented improvement in readability inert white screen J. D. Garner J. G. Blethrow largest sign lIBRARYQr light source lOSANCElfj Mean S.D. Range Mounting Slot NBS Smoke obscuring agent OFCAllFOff OJIIvDJO OJIWDJO Oklahoma City ond Address optical density values Photometric Smoke Measurement phototube Postcrash fire Presented at Four readability of emergency READABILITY OF SELF-ILLUMINATED rear viewing window Screening Fog Density Security Classif SELF-ILLUMINATED SIGNS SIGN NUMBER signs were identified sizes of signs Smoke Measurement System SMOKE-OBSCURED ENVIRONMENT Springfield standard deviations Stroke Width three highest luminance UBRARYO UIBRARY0 values two standard Visual Angle white screening fog y0Aavaan