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Published online by Cambridge University Press: 14 August 2015
The spectrum of the microwave background radiation closely resembles that of a blackbody with a peak at 6 cm−1. Many experimenters have contributed to the determination of this simple but important fact. In this review we describe the experimental difficulties which have plagued background measurements in the high frequency Wien region. An evaluation of the present status of our knowledge of the entire spectrum will be given and prospects for future experiments will be mentioned.