Details of device for measuring time interval required for vehicle to travel predetermined fixed distance along highway; two parallel, horizontal light beams directed across roadway are focused onto two photoelectric tubes; when light beams are interrupted, tubes become non-conductive. (published Sept 1942)


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    Title :

    New photo-electric speed recorder and its adaptation to two-way traffic counting


    Additional title:

    Wash State College -- Eng Experiment Station -- Bul


    Contributors:
    Dana, H.J. (author) / Clarke, H.F. (author)


    Publication date :

    1941


    Size :

    12 pages


    Type of media :

    Report


    Type of material :

    Print


    Language :

    English




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