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Parabolic mirrors are used for Beamcasting at the Chicago Century of Progress Exposition. This is the apparatus under test. Its sponsors guarantee that, unless the beam is intercepted. complete privacy is secured.
This picture and caption was all that appeared in Wireless World but the original article appeared in Short Wave Craft in September 1933. The diagram below appears in the magazine and the full article as a PDF can be found here.
The system operated at a wavelength of 9 cm or 3.3 GHz.
Graph showing graphically the various wavelengths.
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