Abstract
A detailed description is given of a liquid-helium-cooled. Fourier transform spectrometer recently flown on a rocket. The instrument was used to make new precise measurements of the spectrum of the cosmic background radiation in the wave number range 2–30 cm−1, as reported by H. P. Gush, M. Halpern, and E. Wishnow [Phys. Rev. Lett. 65, 537 (1990)].
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