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108 glass helices and wound with 20 ft. of No. 24 Nichrome wire which served as a heating unit. Other dimensions are proportional to the illustration and are not especially critical. SUMMARYA new method has been developed for synthesizing substituted vinyl compounds which consists in altering polymers chemically and then depolymerizing them. The method has been applied especially satisfactorily to the preparation of halogenated styrenes.An extensive study of the depolymerization of polyvinyl compounds has been made and factors influencing yields of monomers have been determined. Lafayette, Ind.

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Current oscillations were observed in Au‐compensated Si samples with two Au Schottky contacts. The oscillations are not sinusoidal, their frequency is in the 100 kHz range. This is quite different from the observations of Holonyak et al. at p‐i‐n diodes, in which sinusoidal oscillations in the frequency range of 5 to 100 MHz were obtained. The occurrence of these oscillations can be explained by means of double injection if the injection model of Sze et al. is used. According to this model the minority carrier concentration strongly increases in a semiconductor provided with two Schottky contacts if the two depletion regions touch each other. The large ratio of the amplitude of the oscillations and the dc current, the deviation from the sinusoidal waveform, the low frequencies and the large range of bias in which these oscillations occur, however, justify the assumption that the current oscillations occur with single injection as well.

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Investigations of current oscillations observed in high resistivity Au‐compensated n+–i–in+ and p+–p+ silicon samples are reported. The specific resistivities of the i regions are 20 k Ω cm and about 105 Ωcm at the n‐type Si and 14 k Ωcm at the p‐type silicon, respectively. The dc I–U‐characteristics and the contact preparation justify the assumption that single injection SCLC are attributable to the current oscillations and that double injection is negligible. The waveforms of the oscillations are not sinusoidal in general. The frequencies are in the range of 100 kHz at the 105 Ωcm material. In the 20 k Ω cm samples a pulse like waveform is typical for the current instabilities and the repetition rate of the pulses is about 10 kHz. Measurements using voltage pulses show that current oscillations are initiated a certain delay time after applying the voltage pulse, if a critical trap occupation is reached.