A new method of determining the electrical properties of dielectrics at centimetre wave-lengths is described. Although this is a free-wave method it requires only relatively small amounts of the substance and is particularly applicable to measurements on solid materials. The method has been employed at a wave-length of 12.0 cm. to measure the refractive indices and the absorption coefficients of some common laboratory substances. The results obtained are given and briefly discussed.
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Velasco et al. (1939) studied this question.
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