Abstract
An outline is given of a general method of accounting for the effect of electronic and ionic space charge in the breakdown of solid and liquid dielectrics. Detailed calculations are performed for a special model of both a liquid and a solid dielectric, and the results are compared with recent experimental work. Ex(tct calculation is not possible, but it is shown that for some substances an effect due to cathode material may well be measurable, and the factors influencing such an effect are examined.