The paper gives the results of a year's observations on the electrical constants of a grass-covered sandy loam site at the National Physical Laboratory. Measurements of the reflection coefficient of the ground for radiation of wavelength 5 m indicated that the dielectric constant varied between 5 and 25, and that the conductivity varied from 0.7 ???????? 108 to 4 ???????? 108 e.s.u. Measurements of the attenuation in soil were also made at wavelengths of 5 m and 2 m, and the results indicated similar values for the electrical constants.
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