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Show SCIENTIST SEES RADIO I PRIVATE AS TELEPHONE i 4- (By XEA Service) ROCHESTER, April 28. Talking! j by radio may become as private as: I talking by line telephone. Earl C. Karker. instructor at the University of Rochester, says It Is ; possible, He has already worked out 1 a method of guiding short wave ! lengths. Scientists arc trying further to give I radio waves a senoe of direction that ' will keep hli-and-jiilss radiation out ' of the air. If they succoed, private radio conversation will be possible. 81 ILL INEFFICIENT. "Radio transmission " says Karki r, even at best Is still a very inefficient ineffi-cient system of communication be-t.iiise be-t.iiise it lacks directional propertie . EUuliatlon occurs practically in ill directions, s. .in. one soon win undoubtedly evolve a means of directing these .a -.- In a beam slniilar to the effect; produced by udng a reflector with a ' I source of light. By thin means, thy i 1 entire energy of the llyht may be directed without great decrease In in-nsltj in-nsltj in a kIwii direction for a con-iderable con-iderable distance "Radio transmission by such a 4c via will be accomplished with much i - expenditure or energy Antennae are directional to some1 extent. But nothing much has yet I ; been done In the way of reflecting j radio waves. Of course, the magnitude magni-tude of the reflector would have to be enormous If we keep on using the same wave lengths that wo use now SUGGESTS KEFLECTOH. "But may It not become possible by i tho use of a reflector to produce auf-I auf-I ficlent radiation In a given direction! at a much shorter wave length0 "Ono can now reflect short radio j wave by merely placing a metallic 8 y I EARL C. K ltlv I AL reflector behind them. I have done "The waves are sent out in parallel paral-lel beams, caught by a similar reflec-1 tor and brought to a focus with all corresponding increase in energy at the focal point." .Sounds easy "Some day," adds Karker. 'the large transmitting and receiving sta - 1 tlons may find that it works out Just as easy as it sounds." |