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An experiment involving a conducting sphere that oscillates between two electrodes is described. Theory is presented that predicts a linear relationship between frequency and applied voltage for the system, regardless of electrode configuration. Data taken for several geometries is in good agreement with this theory. Some properties of the oscillator system, including its desirable characteristics as a high voltage voltmeter, are discussed.

A re-examination of the N.M.R. spectrum of mercury dimethyl using heteronuclear double resonance techniques confirms the values of the directly bonded and geminal coupling constants obtained by McLauchlan et al. [4]. The use of a locked oscillator system enables the signs and magnitudes of the vicinal and long-range coupling constants to be determined. The values obtained are 3 J 13C--H = -1·9±0·2 c/s and 4 J H---H = +0·45±0·02 c/s respectively. The chemical shifts of the 13C and 199Hg resonances relative to T.M.S. are also given.

An improved oscillator system is described for use in high‐frequency polarization modulation experiments. The improvement provides constant polarization modulation even when the resonant Q of the modulator crystal varies. A scanning split‐beam spectrophotometer providing digital output of optical density has been developed which is readily interchangeable with other applications of the system.

The temperature dependence of the frequency, ωa, and lifetime, ωa, of the ferroelectric mode of KH2ASO4, RbH2AsO4, CsH2AsO4, and their deuterated isomorphs is educed by fitting measured low-frequency y(xy)x Raman spectra in the paraelectric phase to a coupled oscillator system. The results are consistent with the use of a response function for the ferroelectric mode of the form [image omitted]