Not only is every motor car which passes through the Holland Tunnels counted electrically, but a new application of the same electric eye, or photo-electric cell, has now been installed to give warning of dangerous exhaust gases from automobiles.


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    Title :

    Electric eye detects gas in Holland tube


    Published in:

    Publication date :

    1930-06-01


    Size :

    772222 byte




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



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