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Show Navigation By Radio While radio as been employed as an aid to navigation of both ships and aircraft for several years, by means of radio beacons of various types, the use of this mysterious force is des-! des-! tined to play an ever increasing part in directing these crafts safely along their courses. R. H. Marriott, consulting engineer of the Federal Radio Commission, recently re-cently described a newly developed method whereby what may be described de-scribed as an electric track may be laid for both ships and aircraft to fol- low. This "track" consists of a cable carrying car-rying a high frequency current, which mduces a similar frequency in a coil carried by steamer or airplane. When the craft is on its course, which is directly over the cable, the helmsman hears a buzzing signal, which dies out if he gets off the "track." These cables may be laid down in the middle of a harbor channel for the guidance of ships, or strung on poles like a telegraph line from city to city for the direction of airplanes and dirigibles dir-igibles Dangers from rain, snow and "fog the terrors of the navigator by sea' or air, would thus be practically Eliminated. As a large percentage ol accidents to both ships and airplanes are due to these dangers, the great value of the device described by Mr. Marriott may be readily appreciated. |