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Show WIRELESS STUNT TAKEN FROM ARMY By hitching their aerial to a balloon, bal-loon, some radio fans have been able to make their crystal detectors do the work of a vacuum tube and amplifier receiving set, according to the current Issue of Popular Science Monthly. They learned tho trick from the army. Military reconnaissance officers offi-cers frequently send up a balloon when there Is .no time to rig up th? usual aerial. A single wire carried up 600 feet will "pick up" signals that are seldom sel-dom caught even by the larger sets. |