Portable instrument, Night Visibility Meter, developed to measure directional reflectances of traffic paints and traffic signs for geometric conditions of night use; it is visual instrument operating on equality of brightness principal; inside instrument, 6-v automobile lamp is used as source, projection lens and mirror direct nearly parallel beam of light from this lamp toward sample panel.


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    Title :

    Night reflectance of traffic paints and signs


    Additional title:

    Traffic Eng


    Contributors:

    Published in:

    Publication date :

    1947


    Size :

    6 pages


    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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