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| Keywords: Rayleigh differential refractometer at the Automotive Laboratory of the National Bureau of Standards.jpg A Rayleigh differential refractometer interferometer at the Automotive Laboratory at NBS utilizes interference phenomena to determine the difference in refractive index between two samples of a distillate The number of time-consuming freezing-point determinations needed to evaluate a distillation is materially reduced through the use of this interferometer In the evaluation of the relative purity of successive distillation fractions the differences in the refractive index are determined with a precision of better than one part in a million A test requires about 5 minutes using 3 to 4 mL of sample most of which may be recovered Operator E H Rich National Institute of Standards and Technology National Institute of Standards and Technology The images in the Automobile Research Photographic Collection are in the public domain and are not subject to copyright in the United States However please pay special attention to the individual works to make sure there are no copyright restrictions indicated Individual works may require securing other permissions from the original copyright holder Use of the images from NIST Digital Collections is not restricted but a statement of attribution is required Please use the following attribution statement National Institute of Standards and Technology Digital Collections Gaithersburg MD 20899 PD-USGov National Bureau of Standards National Institute of Standards and Technology Automobile safety History of automobiles Automobile equipment | ||||
