Counter built by General Electric Co. consists of photoelectric cell installed in box near roadway, on which shines electric light located in ceiling of tunnel; as vehicle crosses beam of light, current is caused to flow; low-energy relay operates counter which records number of impulses and consists of photoelectric cars.


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    Title :

    Photo-electric cell counts traffic in Holland tube


    Additional title:

    Eng. Contracting


    Published in:

    Publication date :

    1929


    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English





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