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3-17-99L National Aeronautics 8-inch open jet Aerodynamic 9.2.2 Aeronautics and Space Angle of attack Approximate Mach number arc lamps BOUNDARY-LAYER FLOW VISUALIZATION camera set china clay Clair Avenue Copies obtainable Descriptions and examples desired test conditions development of technique Donald Dow Corning especially adapted experience and development flow patterns flow-visualization fluorescein fluorescent additive Fluorescent Green C.H. fluorescent-oil film method Fluorescent-oil film pattern hydrofoil indicated Katzoff kerosene Kodak Tri-X film laminar Langley 8-foot transonic Langley Field Langley Research Center Langley Unitary Plan large high method is especially method which appears methods recently investigated NACA NASA MEMORANDUM 3-17-99L observed obtainable from NASA particularly the fluorescent-oil pattern on surface powered wind tunnels previous methods radiometer reach desired test require considerable require less experience Space Administration speed spray bar spraying technique sweptback-wing model technique than previous TECHNIQUES FOR BOUNDARY-LAYER Tests in Langley transition fixed tunnels that require turbulent areas ultraviolet light viscosity wing model Wratten Filter