Illustrated description of a semaphore signal, which is claimed to present the same appearance, as to color and position, at night as during the day.


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    Title :

    Koyl parabolic semaphore railroad signals


    Additional title:

    Ry Rev


    Published in:

    Publication date :

    1889


    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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