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Show Visual Signal Apparatus to Show Radio Beacons Washington. A device for visually interpreting signals of aeronautical radio ra-dio range beacons has been developed by W. E. Jackson and L. M. Harding, radio engineers of the Commerce department's de-partment's aeronautics branch, according accord-ing to Rex Martin, assistant director of aeronautics. ; Signals, Martin explained, are received re-ceived through headphones by airmen who rely upon them for guidance during dur-ing periods of poor visibility. The device features an indicator which, fitted in the Instrument panel, is similar to the contrivance used for blind landings. It is open-faced and has two needles one vertical and one horizontal. The vertical needle, Martin Mar-tin explained, is chief indicator, and when a plane leaves the course defined by a radio beacon, this needle will move accordingly. However, he add ed, if the plane is exactly on course, the vertical pointer will remain in cen ter of the dial. The horizontal indicator, the official revealed, shows the volume of received signals, which the pilot may adjust as ne sees fit |