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Photographic studies of the growth of spark discharges in non-uniform fields, together with oscillographic records of the currents in the discharges, show that the predischarge channels grow in steps which result from the constriction of corona streamers. The observed effects are explained by consideration of the influence of the constrictions on the voltage gradients in the discharge.
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G. M. Petropoulos (1964) studied this question.
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