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absolute coefficient adjustment air of density ambient air Ames Aeronautical Laboratory Angle of attack angstroms axis beams of light boundary layer camera compensating plate constant cross hairs density distributions Density Fields density gradient density variation determined velocity distribution distance edge equation exit slit figure 17 film flow field focal length free jet FREE SUPERSONIC JET fringe number fringe positions fringe shift horizontal images inches downstream inches from nozzle incompressible jet index of refraction inside boundary interfero interferograms interferometer jet of Mach Langley Aeronautical Laboratory lens light source Mach number 1.6 Mach-Zehnder magnesium measured mixing length mixing region mixing zone monochromatic monochromator optical-path length plotted portion present report pressure rate of spread reference Reynolds number room air rotation set of cross shown in figure Snell's law splitter plate S2 stagnation temperature subsonic telescope test section theoretical velocity distribution theory tion Tollmien's TURBULENT MIXING value for ay/x white-light fringes width