Flying in the densest fog will soon have no terrors for the aviator. On the airway between Dayton, Ohio, and Moundsville, W. Va., the Army Air Service has installed a "radio compass," with electric oscillations flashing between the towers at either end of the airway. An aviator flying exactly on the course hears only dashes; if his plane turns to left or right of the course and a coil in his receiving equipment is at an angle to the course, he hears a warning signal, dash and dot, or dot and dash, as...
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