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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    Titel :

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


    Weitere Titelangaben:

    Wash State College -- Eng Experiment Station -- Bul


    Beteiligte:
    Dana, H.J. (Autor:in) / Clarke, H.F. (Autor:in)


    Erscheinungsdatum :

    1941


    Format / Umfang :

    12 pages


    Medientyp :

    Report


    Format :

    Print


    Sprache :

    Englisch




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