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In 1940, dielectric measurements in the centimeter range were considered as difficult and not very accurate. The authors, therefore, developed a ``hollow-pipe'' method which overcame these objections and required only a weak oscillator and small amounts of the dielectric material. The theory and its practical applications, as perfected by March 1941, are presented in this paper.

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The observed dielectric constants of alkali halides and certain other types of crystals coincide with a relatively simple interpretation of dielectric polarization which is based on the classical equation of Clausius and Mosotti. The polarizability of each elementary ion has only a small positive temperature coef5cient and is invariant when the given ion is incorporated in different crystalline solids subject to certain symmetry requirements. The polarizabilities of the ions in cubic barium titanate, although normal, account quite satisfactorily for the high observed values of dielectric constant. A method of estimating dielectric constants from the known polarizabilities of ions is applied to several compounds for which dielectric data have not been reported.

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