Pilots flying the night mail through fog and rain that blanket all ground lights, follow a trail of dots and dashes which flow from radio range-beacons into their earphones. But sounds are sometimes deceiving, subject to radio interference. Skill is required to compare the relative strength of opposing signals. And at 15-minute intervals the guiding stream of signals are interrupted completely for broadcast weather reports.
For better guidance, the research division of the aeronautics branch, Department of Commerce, has spent three years in developing a device by which the pilot may see...
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