An elastic constant-internal friction spectrometer has been developed which has proved to be very useful in measurements which must last over extended periods of time as well as in measurements which require a high degree of resolution. The essential feature of the spectrometer is the fact that it holds the sample in oscillation at its resonance frequency and at a preset strain amplitude, and measures the internal friction of the sample through a measurement of the driving force necessary to maintain the preset amplitUde.

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A recent study of the insulator problem involved in radiation detection instruments disclosed the fact that insulators, in high impedance input circuits, are the predominate source of background noise when subjected to high voltages and high humidities. Methods for eliminating this trouble in some of the commonly used circuit components, and new and superior insulating materials, were found.