Smithsonian Report, 1959—Maxwell PLATE 1 
OR AYRES 
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43 ae 
1. One arm of the crossed periodic array used for solar observations at 21 cm. in Sydney. 
(Photograph courtesy of CSIRO Division of Radiophysics, Sydney, Australia.) 
2. The 28-foot antenna and 4-octave primary feed system used for solar radio observations 
at the Harvard Radio Astronomy Station, Fort Davis, Tex. 
