The dielectric properties of the solvents formamide, ethanediol and methanol have been studied over a frequency range of 10 MHz-70 GHz and a temperature range of 10-40 degrees C. It was found that formamide is best represented by a single Debye type dispersion, ethanediol by a double Debye and methanol by a Cole-Cole distribution of relaxation times.

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A coaxial line transmission cell is described which allows accurate permittivity measurements to be made on lossy liquids over the frequency range 90 MHz to 2 GHz. To test the performance of the cell, measurements were made on water, methanol and ethanol at 293K.

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