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.
Night reflectance of traffic paints and signs
Traffic Eng
Traffic Engineering ; 17 , n 11
1947
6 pages
Aufsatz (Zeitschrift)
Englisch
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